Bump actions/checkout from 5 to 6

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]>

Author: dependabot[bot]

.github/workflows/build.yml

@@ -6,7 +6,7 @@ jobs:
   build-on-linux:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
     - run: uname -m
     - run: sudo apt-get install -y chrpath
     - run: rustup target list --installed
@@ -20,7 +20,7 @@ jobs:
   build-on-darwin-x86_64:
     runs-on: macos-15-intel
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
     - run: uname -m
     - run: rustup target add aarch64-apple-darwin
     - run: make download download-dependencies
@@ -34,7 +34,7 @@ jobs:
   build-on-darwin-arm64:
     runs-on: macos-14
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
     - run: uname -m
     - run: rustup target add x86_64-apple-darwin
     - run: make download download-dependencies

.github/workflows/check.yml

@@ -24,7 +24,7 @@ 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 }}"

.github/workflows/docker-build.yml

@@ -13,7 +13,7 @@ jobs:
         - DOCKER_FILE=Dockerfile.debian DOCKER_TAG_SUFFIX=-debian
       fail-fast: false
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
     - uses: docker/login-action@v3
       with:
         registry: ghcr.io

.github/workflows/livecheck.yml

@@ -14,7 +14,7 @@ jobs:
   livecheck:
     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'