deps(actions): bump actions/checkout from 5 to 6 (#487)

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

Author: dependabot[bot]

.github/workflows/check-typos.yaml

@@ -10,7 +10,7 @@ jobs:
 
     steps:
       - name: Checkout code
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Check typos
         uses: crate-ci/typos@v1.39.2

.github/workflows/ci-pr-checks.yaml

@@ -13,7 +13,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout source
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Sanity check repo contents
         run: ls -la

.github/workflows/ci-release.yaml

@@ -12,7 +12,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout source
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Set project name from repository
         id: version

.github/workflows/md-link-check.yml

@@ -14,7 +14,7 @@ jobs:
 
     steps:
       - name: Checkout code
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Install lychee v0.18.1
         run: |

.github/workflows/unstale.yaml

@@ -17,7 +17,7 @@ jobs:
        contains(github.event.issue.labels.*.name, 'lifecycle/rotten'))
     steps:
       - name: 'Checkout repository'
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: 'Remove stale labels'
         env: