build(deps): 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] <support@github.com>

Author: dependabot[bot]

.github/workflows/links.yml

@@ -18,7 +18,7 @@ jobs:
         permissions:
             issues: write # required for peter-evans/create-issue-from-file
         steps:
-            - uses: actions/checkout@v5
+            - uses: actions/checkout@v6
 
             - name: Link Checker
               id: lychee

.github/workflows/lock-integrity.yml

@@ -14,7 +14,7 @@ jobs:
 
         steps:
             - name: Checkout code
-              uses: actions/checkout@v5
+              uses: actions/checkout@v6
 
             - name: Set up Node.js
               uses: actions/setup-node@v6

.github/workflows/prettier.yml

@@ -14,7 +14,7 @@ jobs:
 
         steps:
             - name: Checkout code
-              uses: actions/checkout@v5
+              uses: actions/checkout@v6
 
             - name: Set up Node.js
               uses: actions/setup-node@v6

.github/workflows/vendor-integrity.yml

@@ -14,7 +14,7 @@ jobs:
 
         steps:
             - name: Checkout code
-              uses: actions/checkout@v5
+              uses: actions/checkout@v6
 
             - name: Set git config to ignore line endings
               run: |