chore(deps): update actions/checkout action to v5

Author: renovate[bot]

.github/workflows/release_gem.yml

@@ -10,7 +10,7 @@ jobs:
   release:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
         with:
           fetch-depth: 0
       - id: release-gem

.github/workflows/test.yml

@@ -17,7 +17,7 @@ jobs:
         ruby_version: ["3.2", "3.3", "3.4"]
         os: ["ubuntu-latest","windows-latest","macos-latest"]
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
       - uses: ruby/setup-ruby@v1
         with:
           ruby-version: ${{ matrix.ruby_version }}