chore(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] <[email protected]>

Author: dependabot[bot]

.github/workflows/build.yml

@@ -4,7 +4,7 @@ jobs:
   build:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         # waiting on: https://github.com/actions/setup-node/issues/531
       - run: corepack enable
       - uses: actions/setup-node@v6

.github/workflows/publish.yml

@@ -28,10 +28,10 @@ jobs:
       name: NPM
       url: https://www.npmjs.com/package/esbuild-plugin-browserslist/v/${{ needs.release.outputs.version }}
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           fetch-depth: 0
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       # waiting on: https://github.com/actions/setup-node/issues/531
       - run: corepack enable
       - uses: actions/setup-node@v6