Bump actions/checkout from 5 to 6 (#182)

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/reusable-check-branch-alias.yml

@@ -27,7 +27,7 @@ jobs:
 
     steps:
       - name: Check out source code
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           fetch-depth: 0 # Fetch all history for all tags
           token: ${{ secrets.GITHUB_TOKEN }}

.github/workflows/reusable-manage-labels.yml

@@ -15,7 +15,7 @@ jobs:
     if: ${{ github.repository_owner == 'wp-cli' }}
     steps:
       - name: Check out source code
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Set up PHP environment
         uses: shivammathur/setup-php@v2