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

Author: renovate[bot]

.github/workflows/build.yml

@@ -20,7 +20,7 @@ jobs:
       contents: write
       attestations: write
     steps:
-      - uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
+      - uses: actions/checkout@1af3b93b6815bc44a9784bd300feb67ff0d1eeb3 # v6.0.0
       - uses: SonarSource/ci-github-actions/build-poetry@master # dogfood
         with:
           sonar-platform: sqc-eu

.github/workflows/unified-dogfooding.yml

@@ -13,7 +13,7 @@ jobs:
       id-token: write
       contents: write
     steps:
-      - uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
+      - uses: actions/checkout@1af3b93b6815bc44a9784bd300feb67ff0d1eeb3 # v6.0.0
       - uses: SonarSource/ci-github-actions/build-poetry@master # dogfood
         with:
           run-shadow-scans: true