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](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>

Author: dependabot[bot]

.github/workflows/publish.yml

@@ -13,7 +13,7 @@ jobs:
     outputs:
       version: ${{ steps.version.outputs.version }}
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
     - id: version
       shell: bash
       run: |
@@ -43,7 +43,7 @@ jobs:
     needs: [test, version]
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
     - uses: dtolnay/rust-toolchain@stable
     - name: Dry-run package creation
       # Can't verify test-log for it may depend on yet-to-be-published

.github/workflows/test.yml

@@ -25,7 +25,7 @@ jobs:
         rust: [stable]
         profile: [dev, release]
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
     - uses: dtolnay/rust-toolchain@master
       with:
         toolchain: ${{ matrix.rust }}
@@ -41,7 +41,7 @@ jobs:
     name: Build using minimum versions of dependencies
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Install Nightly Rust
         uses: dtolnay/rust-toolchain@nightly
       - run: cargo +nightly -Z minimal-versions update
@@ -58,7 +58,7 @@ jobs:
     name: Check code formatting
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: dtolnay/rust-toolchain@nightly
         with:
           components: rustfmt
@@ -67,7 +67,7 @@ jobs:
     name: Lint with clippy
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: dtolnay/rust-toolchain@stable
       - uses: Swatinem/rust-cache@v2
       - run: cargo clippy --no-deps --all-targets --all-features -- -A unknown_lints -D warnings
@@ -77,7 +77,7 @@ jobs:
     env:
       RUSTDOCFLAGS: '-D warnings -D rustdoc::broken_intra_doc_links'
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: dtolnay/rust-toolchain@stable
       - uses: Swatinem/rust-cache@v2
       - run: cargo doc --workspace --no-deps --document-private-items