build(deps): bump actions/checkout from 6 to 7

Bumps [actions/checkout](https://github.com/actions/checkout) from 6 to 7.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v6...v7)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: '7'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

.github/workflows/debusine-container-build-and-upload.yml

@@ -50,7 +50,7 @@ jobs:
 
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v6
+        uses: actions/checkout@v7
 
       - name: Build Debian image
         run: |

.github/workflows/debusine.yml

@@ -142,13 +142,13 @@ jobs:
       srcpkg_name: ${{ steps.generate-source-package.outputs.srcpkg_name }}
       srcpkg_version: ${{ steps.generate-source-package.outputs.srcpkg_version }}
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@v7
         with:
           # Using the parent directory for Debian build artifacts is problematic, for example breaking actions/upload-artifact:
           # https://github.com/actions/upload-artifact/issues/176
           path: srcpkg
           ref: ${{ needs.resolve.outputs.source_ref }}
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@v7
         with:
           repository: qualcomm-linux/debusine-action
           ref: ${{ needs.resolve.outputs.debusine_action_ref }}
@@ -206,7 +206,7 @@ jobs:
     outputs:
       workspace: ${{ steps.build.outputs.workspace }}
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@v7
         with:
           repository: qualcomm-linux/debusine-action
           ref: ${{ needs.resolve.outputs.debusine_action_ref }}
@@ -274,13 +274,13 @@ jobs:
       deployments: write
       packages: read
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@v7
         with:
           # Using the parent directory for Debian build artifacts is problematic, for example breaking actions/upload-artifact:
           # https://github.com/actions/upload-artifact/issues/176
           path: srcpkg
           ref: ${{ needs.resolve.outputs.source_ref }}
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@v7
         with:
           repository: qualcomm-linux/debusine-action
           ref: ${{ needs.resolve.outputs.debusine_action_ref }}