Bump actions/checkout from 4 to 6 (#12160)

Bumps [actions/checkout](https://github.com/actions/checkout) from 4 to 6.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](https://github.com/actions/checkout/compare/v4...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>

.github/workflows/ci.yml

@@ -30,7 +30,7 @@ jobs:
       fail-fast: false
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - uses: pnpm/action-setup@v4.2.0
       - name: Use Node.js
         uses: actions/setup-node@v6

.github/workflows/compressed-size.yml

@@ -16,7 +16,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v6
     - uses: pnpm/action-setup@v4.2.0
     - uses: preactjs/compressed-size-action@v2
       with:

.github/workflows/deploy-docs.yml

@@ -23,7 +23,7 @@ jobs:
     needs: correct_repository
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - uses: pnpm/action-setup@v4.2.0
       - name: Use Node.js
         uses: actions/setup-node@v6

.github/workflows/release.yml

@@ -26,7 +26,7 @@ jobs:
     needs: setup
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - uses: pnpm/action-setup@v4.2.0
       - uses: actions/setup-node@v6
         with:
@@ -71,7 +71,7 @@ jobs:
     runs-on: ubuntu-latest
     if: "!github.event.release.prerelease"
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - uses: pnpm/action-setup@v4.2.0
       - uses: actions/setup-node@v6
         with: