Bump actions/checkout from 4 to 6

.github/workflows/add-changelog.yml

@@ -46,7 +46,7 @@ jobs:
   add-changelog:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - name: Add changelog entry
         uses: stellarwp/changelogger@main

.github/workflows/publish.yml

@@ -9,7 +9,7 @@ jobs:
   build:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - uses: actions/setup-node@v4
         with:
           node-version-file: .nvmrc
@@ -20,7 +20,7 @@ jobs:
   check-package-version:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - uses: actions/setup-node@v4
         with:
           node-version-file: .nvmrc
@@ -62,7 +62,7 @@ jobs:
     needs: [build, check-package-version]
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - uses: actions/setup-node@v4
         with:
           node-version-file: .nvmrc

.github/workflows/test.yml

@@ -10,7 +10,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Set Node.js 18.x
         uses: actions/setup-node@v4

.github/workflows/validate-changelog.yml

@@ -7,7 +7,7 @@ jobs:
   validate-changelog:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
         with:
           fetch-depth: 0 # Required for git diff operations
 

.github/workflows/write-changelog.yml

@@ -17,7 +17,7 @@ jobs:
   write-changelog:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - name: Write changelog
         uses: stellarwp/changelogger@main