Bump actions/checkout from 4 to 5 (#39)

Bumps [actions/checkout](https://github.com/actions/checkout) from 4 to
5.

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

.github/workflows/release.yaml

@@ -26,7 +26,7 @@ jobs:
       contents: write
       discussions: write
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
       - name: Create source archive
         run: |
           rake dist VERSION=${GITHUB_REF_NAME}

.github/workflows/test.yaml

@@ -30,7 +30,7 @@ jobs:
     runs-on: ubuntu-latest
     timeout-minutes: 5
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
         with:
           submodules: recursive
       - name: Install pre-commit
@@ -55,7 +55,7 @@ jobs:
           - ubuntu-22.04
           - ubuntu-24.04
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
         with:
           submodules: recursive
       - name: "C++: Install dependencies"