chore(deps): bump actions/checkout

Bumps the github-actions group with 1 update in the / directory: [actions/checkout](https://github.com/actions/checkout).


Updates `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
  dependency-group: github-actions
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

.github/workflows/ci_nix.yml

@@ -6,7 +6,7 @@ jobs:
   nix_fmt:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: boinkor-net/ci-baseline-nix/actions/setup@main
         with:
           tailnet_client_id: ${{ secrets.TAILSCALE_CI_CLIENT_ID }}
@@ -23,7 +23,7 @@ jobs:
   nix_flake_safety:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: boinkor-net/ci-baseline-nix/actions/setup@main
         with:
           tailnet_client_id: ${{ secrets.TAILSCALE_CI_CLIENT_ID }}
@@ -40,7 +40,7 @@ jobs:
   nix_test:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: boinkor-net/ci-baseline-nix/actions/setup@main
         with:
           tailnet_client_id: ${{ secrets.TAILSCALE_CI_CLIENT_ID }}
@@ -60,7 +60,7 @@ jobs:
         derivation: [""]
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: boinkor-net/ci-baseline-nix/actions/setup@main
         with:
           tailnet_client_id: ${{ secrets.TAILSCALE_CI_CLIENT_ID }}

.github/workflows/ci_rust.yml

@@ -11,7 +11,7 @@ jobs:
         cargo_test_args: [""]
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: boinkor-net/ci-baseline-rust/actions/test@main
         with:
           rust_toolchain: ${{matrix.rust_toolchain}}
@@ -22,7 +22,7 @@ jobs:
   rust_fmt:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: boinkor-net/ci-baseline-rust/actions/fmt@main
         with:
           rust_toolchain: stable
@@ -31,7 +31,7 @@ jobs:
   clippy:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: boinkor-net/ci-baseline-rust/actions/clippy@main
         with:
           manifest_dir: .
@@ -40,7 +40,7 @@ jobs:
   cargo_deny:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: boinkor-net/ci-baseline-rust/actions/cargo_deny@main
         with:
           manifest_dir: .

.github/workflows/dependabot_regenerate_sri.yml

@@ -22,7 +22,7 @@ jobs:
           private_key: ${{ secrets.PR_FIXUP_APP_PRIVATE_KEY }}
           permissions: >-
             {"contents": "write"}
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           fetch-depth: 0
           token: ${{steps.generate_token.outputs.token}}

.github/workflows/nix_update.yml

@@ -11,7 +11,7 @@ jobs:
       contents: write
       pull-requests: write
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: boinkor-net/ci-baseline-nix/actions/setup@main
         with:
           tailnet_client_id: ${{ secrets.TAILSCALE_CI_CLIENT_ID }}