chore(deps): bump actions/checkout from 5 to 6

Bumps [actions/checkout](https://github.com/actions/checkout) from 5 to 6.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v5...v6)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

.github/workflows/bench.yml

@@ -27,7 +27,7 @@ jobs:
 
     steps:
       - name: Checkout code
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Use OCaml ${{ matrix.ocaml-compiler }}
         uses: ocaml/setup-ocaml@v3

.github/workflows/binaries.yml

@@ -21,7 +21,7 @@ jobs:
             installable: .#dune-static
     runs-on: ${{ matrix.os }}
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           fetch-depth: 0 # for git describe
       - uses: cachix/install-nix-action@v31

.github/workflows/docker-image.yml

@@ -26,7 +26,7 @@ jobs:
 
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Log in to GitHub Container registry
         uses: docker/login-action@v3

.github/workflows/mirage.yml

@@ -9,7 +9,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - name: Clone caldav
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
       with:
         repository: roburio/caldav
         ref: 51f0d150542348dc259b7c9f7bc70ee592243f7f

.github/workflows/multi-repo-build.yml

@@ -35,7 +35,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     steps:
       - name: Checkout Dune
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Set up Nix
         uses: nixbuild/nix-quick-install-action@v34

.github/workflows/workflow.yml

@@ -36,7 +36,7 @@ jobs:
           - ubuntu-latest
     runs-on: ${{ matrix.os }}
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: nixbuild/nix-quick-install-action@v34
         with:
           nix_conf: ${{ env.EXTRA_NIX_CONFIG }}
@@ -58,7 +58,7 @@ jobs:
           - ubuntu-latest
     runs-on: ${{ matrix.os }}
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: nixbuild/nix-quick-install-action@v34
         with:
           nix_conf: ${{ env.EXTRA_NIX_CONFIG }}
@@ -74,7 +74,7 @@ jobs:
     name: Format
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: nixbuild/nix-quick-install-action@v34
         with:
           nix_conf: ${{ env.EXTRA_NIX_CONFIG }}
@@ -90,7 +90,7 @@ jobs:
     name: Documentation
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: nixbuild/nix-quick-install-action@v34
         with:
           nix_conf: ${{ env.EXTRA_NIX_CONFIG }}
@@ -113,7 +113,7 @@ jobs:
           - ubuntu-latest
     runs-on: ${{ matrix.os }}
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: nixbuild/nix-quick-install-action@v34
         with:
           nix_conf: ${{ env.EXTRA_NIX_CONFIG }}
@@ -134,7 +134,7 @@ jobs:
           - ubuntu-latest
     runs-on: ${{ matrix.os }}
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: nixbuild/nix-quick-install-action@v34
         with:
           nix_conf: ${{ env.EXTRA_NIX_CONFIG }}
@@ -202,7 +202,7 @@ jobs:
 
     steps:
       - name: Checkout code
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       # The 32 bit gcc/g++ packages are by default out-of-date so we need to
       # manually update our package listing.
@@ -255,7 +255,7 @@ jobs:
     needs: nix-build
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: nixbuild/nix-quick-install-action@v34
         with:
           nix_conf: ${{ env.EXTRA_NIX_CONFIG }}
@@ -286,7 +286,7 @@ jobs:
           token: ${{ github.token }}
 
       - name: Checkout Code
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Use OCaml 5.2.x
         uses: ocaml/setup-ocaml@v3
@@ -312,7 +312,7 @@ jobs:
     name: Cygwin Build
     runs-on: windows-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Setup Cygwin
         uses: cygwin/cygwin-install-action@v6
         with:
@@ -331,7 +331,7 @@ jobs:
     needs: nix-build
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - name: Install OCaml
         uses: ocaml/setup-ocaml@v3
@@ -371,7 +371,7 @@ jobs:
         uses: ocaml/setup-ocaml@v3
         with:
           ocaml-compiler: ${{ matrix.ocaml-compiler }}
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Create an empty switch
         run: opam switch create . --empty
       - name: Pin local packages to local dependencies
@@ -386,7 +386,7 @@ jobs:
     needs: nix-build
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: nixbuild/nix-quick-install-action@v34
         with:
           nix_conf: ${{ env.EXTRA_NIX_CONFIG }}
@@ -402,7 +402,7 @@ jobs:
     name: Test that the utop dev tool can be built and run
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: nixbuild/nix-quick-install-action@v34
         with:
           nix_conf: ${{ env.EXTRA_NIX_CONFIG }}