Bump actions/checkout from 5 to 6 (#220)

Bumps [actions/checkout](https://github.com/actions/checkout) from 5 to 6.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v5...v6)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

.github/workflows/check.yml

@@ -21,7 +21,7 @@ jobs:
         - jruby-10.0
       fail-fast: false
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
     - uses: ruby/setup-ruby@v1
       with:
         ruby-version: "${{ matrix.ruby }}"
@@ -40,7 +40,7 @@ jobs:
         # - alpine
       fail-fast: false
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
     - run: |
         if command -v apt-get &> /dev/null; then
           apt-get update
@@ -69,7 +69,7 @@ jobs:
         - '3.4'
       fail-fast: false
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
     - uses: ruby/setup-ruby@v1
       with:
         ruby-version: "${{ matrix.ruby }}"
@@ -92,7 +92,7 @@ jobs:
   update_worker_options_in_readme:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
     - uses: ruby/setup-ruby@v1
       with:
         ruby-version: '3'

.github/workflows/rubocop.yml

@@ -8,7 +8,7 @@ jobs:
   rubocop:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
     - uses: ruby/setup-ruby@v1
       with:
         ruby-version: '3'