build(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](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/build-host.yml

@@ -17,11 +17,11 @@ jobs:
       matrix:
         host: ${{ fromJson(inputs.hosts) }}
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: cachix/install-nix-action@v31
         with:
           extra_nix_config: experimental-features = nix-command flakes pipe-operators
-      - uses: cachix/cachix-action@v15
+      - uses: cachix/cachix-action@v16
         with:
           name: sebastian-stork
           authToken: "${{ secrets.CACHIX_AUTH_TOKEN }}"

.github/workflows/ci.yml

@@ -15,7 +15,7 @@ jobs:
       servers: ${{ steps.servers.outputs.servers }}
       workstations: ${{ steps.workstations.outputs.workstations }}
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: cachix/install-nix-action@v31
         with:
           extra_nix_config: experimental-features = nix-command flakes pipe-operators
@@ -56,11 +56,11 @@ jobs:
       matrix:
         package: ${{ fromJson(needs.parse-flake.outputs.packages) }}
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: cachix/install-nix-action@v31
         with:
           extra_nix_config: experimental-features = nix-command flakes pipe-operators
-      - uses: cachix/cachix-action@v15
+      - uses: cachix/cachix-action@v16
         with:
           name: sebastian-stork
           authToken: "${{ secrets.CACHIX_AUTH_TOKEN }}"
@@ -76,11 +76,11 @@ jobs:
       matrix:
         check: ${{ fromJson(needs.parse-flake.outputs.checks) }}
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: cachix/install-nix-action@v31
         with:
           extra_nix_config: experimental-features = nix-command flakes pipe-operators
-      - uses: cachix/cachix-action@v15
+      - uses: cachix/cachix-action@v16
         with:
           name: sebastian-stork
           authToken: "${{ secrets.CACHIX_AUTH_TOKEN }}"
@@ -108,7 +108,7 @@ jobs:
     permissions:
       contents: write
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Push to deploy branch
         run: git push --force origin HEAD:refs/heads/deploy
   await-deploy:

.github/workflows/update.yml

@@ -7,7 +7,7 @@ jobs:
   update:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           token: ${{ secrets.PAT }}
       - uses: cachix/install-nix-action@v31