chore(deps): bump actions/checkout from 5 to 6 (#421)

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

Author: dependabot[bot]

.github/workflows/benchmarks.yml

@@ -25,7 +25,7 @@ jobs:
       contents: write
     steps:
     - name: Check out repo
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
       with:
         persist-credentials: false
 

.github/workflows/ci.yml

@@ -31,7 +31,7 @@ jobs:
       contents: read
     steps:
       - name: Check out repo
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           persist-credentials: false
 
@@ -48,7 +48,7 @@ jobs:
         node-version: [20, 22, 24]
     steps:
       - name: Check out repo
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           persist-credentials: false
 

.github/workflows/metrics.yml

@@ -22,7 +22,7 @@ jobs:
       contents: write
     steps:
     - name: Check out repo
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
       with:
         persist-credentials: false