chore(deps): update actions/checkout action to v6

Author: renovate[bot]

.github/workflows/ci.yml

@@ -18,7 +18,7 @@ jobs:
         suite: [default]
         os: [ubuntu-20.04]
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: ruby/setup-ruby@v1
         with:
           ruby-version: "3.1"
@@ -55,7 +55,7 @@ jobs:
           - opensuse-15
           - dockerfile
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: ruby/setup-ruby@v1
         with:
           ruby-version: "3.1"
@@ -77,7 +77,7 @@ jobs:
           - capabilities
         os: [ubuntu-2004, ubuntu-2204, ubuntu-2404]
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: ruby/setup-ruby@v1
         with:
           ruby-version: "3.1"

.github/workflows/publish.yaml

@@ -18,7 +18,7 @@ jobs:
           token: ${{ secrets.PORTER_GITHUB_TOKEN }}
 
       - name: Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         if: ${{ steps.release.outputs.release_created }}
 
       - name: Build and publish to GitHub Package