Upgrade actions/checkout v5.0.0 -> v6.0.0 (#1994)

See:
- https://github.com/actions/checkout/releases/tag/v6.0.0
- https://github.com/actions/checkout/releases/tag/v5.0.1
- actions/checkout@v5.0.0...v6.0.0

Author: Picnic-DevPla-Bot

.github/workflows/deploy-website.yml

@@ -40,7 +40,7 @@ jobs:
             www.youtube.com:443
             youtrack.jetbrains.com:443
       - name: Check out code
-        uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
+        uses: actions/checkout@1af3b93b6815bc44a9784bd300feb67ff0d1eeb3 # v6.0.0
         with:
           persist-credentials: false
       - uses: ruby/setup-ruby@d5126b9b3579e429dd52e51e68624dda2e05be25 # v1.267.0

.github/workflows/openssf-scorecard.yml

@@ -40,7 +40,7 @@ jobs:
             *.sigstore.dev:443
             www.bestpractices.dev:443
       - name: Check out code
-        uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
+        uses: actions/checkout@1af3b93b6815bc44a9784bd300feb67ff0d1eeb3 # v6.0.0
         with:
           persist-credentials: false
       - name: Run OpenSSF Scorecard analysis

.github/workflows/suggest-commit-message.yml

@@ -63,7 +63,7 @@ jobs:
             core.setOutput('headRef', pr.head.ref ?? '');
             core.setOutput('headSha', pr.head.sha ?? '');
       - name: Check out pull request head
-        uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
+        uses: actions/checkout@1af3b93b6815bc44a9784bd300feb67ff0d1eeb3 # v6.0.0
         with:
           ref: ${{ steps.pr-details.outputs.headSha }}
           fetch-depth: 0