Bump actions/checkout from 5 to 6 (#560)

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>
Co-authored-by: Patrik Ragnarsson <[email protected]>

Author: dependabot[bot]

.github/workflows/codeql-analysis.yml

@@ -25,7 +25,7 @@ jobs:
 
     steps:
     - name: Checkout repository
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
 
     # Initializes the CodeQL tools for scanning.
     - name: Initialize CodeQL

.github/workflows/release.yml

@@ -19,7 +19,7 @@ jobs:
       - name: Install libidn
         run: sudo apt-get install libidn11-dev
 
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - uses: ruby/setup-ruby@v1
         with:

.github/workflows/test.yml

@@ -18,7 +18,7 @@ jobs:
     env:
       IDNA_MODE: ${{ matrix.idna_mode }}
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - name: Install libidn
         run: sudo apt-get install libidn11-dev
@@ -54,7 +54,7 @@ jobs:
       COVERALLS_DEBUG: true
       CI_BUILD_NUMBER: ${{ github.run_id }}
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - name: Install libidn
         run: sudo apt-get install libidn11-dev
@@ -124,7 +124,7 @@ jobs:
       # https://github.com/jruby/jruby/issues/7182#issuecomment-1112953015
       JAVA_OPTS: -Djdk.io.File.enableADS=true
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - name: Install libidn (Ubuntu)
         if: startsWith(matrix.os, 'ubuntu')