Bump actions/checkout from 4 to 6

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](actions/checkout@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>

Author: dependabot[bot]

.github/workflows/codeql.yml

@@ -12,7 +12,7 @@ jobs:
     steps:
       -
         name: '⤵️ Check out code from GitHub'
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
       -
         name: '🏗 Initialize CodeQL'
         uses: github/codeql-action/init@v3

.github/workflows/labels.yml

@@ -16,7 +16,7 @@ jobs:
     steps:
       -
         name: '⤵️ Check out code from GitHub'
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
       -
         name: '🚀 Run Label Syncer'
         uses: micnncim/action-label-syncer@v1.3.0

.github/workflows/test.yml

@@ -10,14 +10,14 @@ jobs:
   build: # make sure build/ci work properly
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - run: |
           npm install
       - run: |
           npm run all
   test: # make sure the action works on a clean machine without building
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
         with:
           fetch-depth: 0 # important!