chore(deps): update actions/checkout action to v6 (#107)

Signed-off-by: bootc-bot[bot] <225049296+bootc-bot[bot]@users.noreply.github.com>
Co-authored-by: bootc-bot[bot] <225049296+bootc-bot[bot]@users.noreply.github.com>

Author: bootc-bot[bot]

.github/workflows/ci.yaml

@@ -27,7 +27,7 @@ jobs:
         os: [ubuntu-latest]
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           ref: ${{ github.event.pull_request.head.sha }}
           fetch-depth: 20
@@ -44,7 +44,7 @@ jobs:
       - name: cargo clippy (non-gating)
         run: cargo clippy
       - name: Checkout ostree-rs-ext
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           repository: ostreedev/ostree-rs-ext
           path: ostree-rs-ext

.github/workflows/cratesio-release.yml

@@ -9,7 +9,7 @@ jobs:
     permissions:
       id-token: write     # Required for OIDC token exchange
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
     - uses: rust-lang/crates-io-auth-action@v1
       id: auth
     - run: cargo publish