Bump actions/checkout from 4 to 5

Bumps [actions/checkout](https://github.com/actions/checkout) from 4 to 5.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v4...v5)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: '5'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

.github/workflows/gem_release.yaml

@@ -15,7 +15,7 @@ jobs:
     name: Build the gem
     runs-on: ubuntu-24.04
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
       - name: Install Ruby
         uses: ruby/setup-ruby@v1
         with:

.github/workflows/tests.yaml

@@ -25,7 +25,7 @@ jobs:
     runs-on: ${{ matrix.cfg.os }}
     steps:
       - name: Checkout current PR
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
 
       - name: Install ruby version ${{ matrix.cfg.ruby }}
         uses: ruby/setup-ruby@v1
@@ -56,7 +56,7 @@ jobs:
     runs-on: ${{ matrix.cfg.os }}
     steps:
       - name: Checkout current PR
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
 
       - name: Install ruby version ${{ matrix.cfg.ruby }}
         uses: ruby/setup-ruby@v1