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](https://github.com/actions/checkout/compare/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>

.github/workflows/check.yml

@@ -14,7 +14,7 @@ jobs:
       matrix:
         os: [ubuntu-latest]
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
     - uses: wimpysworld/nothing-but-nix@main
       with:
         hatchet-protocol: 'carve'

.github/workflows/check_macos.yml

@@ -14,7 +14,7 @@ jobs:
       matrix:
         os: [macos-latest]
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
     - uses: cachix/install-nix-action@v31
       with:
         github_access_token: ${{ secrets.GITHUB_TOKEN }}

.github/workflows/flakehub-publish-rolling.yml

@@ -10,7 +10,7 @@ jobs:
       id-token: "write"
       contents: "read"
     steps:
-      - uses: "actions/checkout@v5"
+      - uses: "actions/checkout@v6"
         with:
           persist-credentials: false
       - uses: "DeterminateSystems/determinate-nix-action@v3"

.github/workflows/update.yml

@@ -10,7 +10,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
       - uses: wimpysworld/nothing-but-nix@main
         with:
           hatchet-protocol: 'carve'