build(deps): bump actions/checkout from 5 to 6 (#9)

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/glibc.yml

@@ -23,7 +23,7 @@ jobs:
     name: Ubuntu Glibc
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Env Version
         run: |
           gcc --version

.github/workflows/musl.yml

@@ -23,7 +23,7 @@ jobs:
     name: Alpine Musl
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Set up Alpine Linux
         uses: jirutka/setup-alpine@v1
         with:

.github/workflows/openlibm.yml

@@ -24,9 +24,9 @@ jobs:
     name: Ubuntu Openlibm
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Checkout Openlibm
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           repository: 'JuliaMath/openlibm'
           path: 'libm/openlibm'