Bump actions/checkout from 6 to 7 (#152)

Bumps [actions/checkout](https://github.com/actions/checkout) from 6 to 7.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](https://github.com/actions/checkout/compare/v6...v7)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: '7'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/buildifier.yaml

diff --git a/.github/workflows/buildifier.yaml b/.github/workflows/buildifier.yaml
index 249d47b..0c4d28c 100644
--- a/.github/workflows/buildifier.yaml
+++ b/.github/workflows/buildifier.yaml
@@ -14,6 +14,6 @@
   check:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@v7
       - name: buildifier
         run: bazel run --enable_bzlmod //.github/workflows:buildifier.check

.github/workflows/ci.yaml

diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index 93c6814..cb20058 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -30,7 +30,7 @@
       USE_BAZEL_VERSION: ${{ matrix.mode.bazel }}
     steps:
       - name: "Checkout the sources"
-        uses: actions/checkout@v6
+        uses: actions/checkout@v7
       - name: Mount bazel caches
         uses: actions/cache@v5
         with:
@@ -57,7 +57,7 @@
       USE_BAZEL_VERSION: ${{ matrix.bazel }}
     steps:
       - name: "Checkout the sources"
-        uses: actions/checkout@v6
+        uses: actions/checkout@v7
       - name: Mount bazel caches
         uses: actions/cache@v5
         with: