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

Author: renovate[bot]

.github/workflows/release.yaml

@@ -24,7 +24,7 @@ jobs:
              exit 1
            fi
       - name: Checkout
-        uses: actions/checkout@93cb6efe18208431cddfb8368fd83d5badbf9bfd # v5.0.1
+        uses: actions/checkout@1af3b93b6815bc44a9784bd300feb67ff0d1eeb3 # v6.0.0
         with:
           ref: master           # only create releases from main branch
       - name: Read section from CHANGELOG.md

.github/workflows/workflow.yaml

@@ -26,7 +26,7 @@ jobs:
         shell: bash
     runs-on: ${{ matrix.os }}
     steps:
-      - uses: actions/checkout@93cb6efe18208431cddfb8368fd83d5badbf9bfd # v5.0.1
+      - uses: actions/checkout@1af3b93b6815bc44a9784bd300feb67ff0d1eeb3 # v6.0.0
       - uses: tweag/configure-bazel-remote-cache-auth@144b0b915f13a418f5eafe2f68d19564ec136c62 # v0.1.1
         with:
           buildbuddy_api_key: ${{ secrets.BUILDBUDDY_API_KEY }}