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/changed.yml

@@ -4,7 +4,7 @@ jobs:
   lint:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
       with:
         fetch-depth: 0
     - uses: tj-actions/changed-files@v47

.github/workflows/checkers.yml

@@ -14,7 +14,7 @@ jobs:
   linkcheck:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
     - uses: JustinBeckwith/linkinator-action@v2
       with:
         paths: '*.md'
@@ -23,7 +23,7 @@ jobs:
   spellcheck:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
     - uses: tbroadley/spellchecker-cli-action@v1
       with:
         dictionaries: '.github/dictionary.txt'

.github/workflows/example.yml

@@ -4,7 +4,7 @@ jobs:
   lint:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
     - uses: DavidAnson/markdownlint-cli2-action@v21
       with:
         globs: |

.github/workflows/test.yml

@@ -12,21 +12,21 @@ jobs:
     name: Run test script
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
     - uses: actions/setup-node@v6
     - run: npm install
     - run: npm run test
   no-globs:
     name: No globs (README.md, 0 errors)
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
     - uses: ./
   one-glob-file:
     name: One glob (test/errors.md, 3 errors)
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
     - uses: ./
       with:
         globs: test/errors.md
@@ -38,15 +38,15 @@ jobs:
     name: One glob (README.md, 0 errors)
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
     - uses: ./
       with:
         globs: '*.md'
   two-globs:
     name: Two globs (README.md and test/errors.md, 3 errors)
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
     - uses: ./
       with:
         globs: |
@@ -60,7 +60,7 @@ jobs:
     name: Separator (README.md and test/errors.md, 3 errors)
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
     - uses: ./
       with:
         globs: '*.md,test/*.md'
@@ -73,7 +73,7 @@ jobs:
     name: config (test/errors.md, 2 errors)
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
     - run: rm .markdownlint.json
     - uses: ./
       with:
@@ -87,7 +87,7 @@ jobs:
     name: config (invalid configuration file, fails)
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
     - uses: ./
       with:
         config: 'invalid.markdownlint.jsonc'
@@ -100,7 +100,7 @@ jobs:
     name: fix (test/errors.md, 0 errors)
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
     - uses: ./
       with:
         fix: true
@@ -109,7 +109,7 @@ jobs:
     name: custom rules (README.md, 0 errors)
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
     - run: rm .markdownlint.json
     - uses: ./
       with:
@@ -119,7 +119,7 @@ jobs:
     name: custom rules (README.md, 2 errors)
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
     - run: rm .markdownlint.json
     - uses: ./
       with: