chore: bump actions/checkout from 5 to 6 in the ci group

Bumps the ci group with 1 update: [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: ci
...

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

Author: dependabot[bot]

.github/workflows/ci.yml

@@ -11,7 +11,7 @@ jobs:
     runs-on: ubuntu-latest
     name: Check formatting
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - name: install stable toolchain
         uses: dtolnay/rust-toolchain@master
@@ -49,7 +49,7 @@ jobs:
     runs-on: ubuntu-22.04
     needs: find-msrv
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: EmbarkStudios/cargo-deny-action@v2
         with:
           rust-version: ${{ needs.find-msrv.outputs.version }}
@@ -63,7 +63,7 @@ jobs:
         os: [macOS-latest, windows-latest, ubuntu-latest]
     name: cargo clippy
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - name: install stable toolchain
         uses: dtolnay/rust-toolchain@stable
@@ -86,7 +86,7 @@ jobs:
     outputs:
       version: ${{ steps.step2.outputs.version }}
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - id: step2
         run: echo "version=`cat Cargo.toml | sed -n 's/rust-version = "\(.*\)"/\1/p'`" >> "$GITHUB_OUTPUT"
 
@@ -98,7 +98,7 @@ jobs:
         os: [macOS-latest, windows-latest, ubuntu-latest]
     name: cargo test
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - name: install stable toolchain
         uses: dtolnay/rust-toolchain@master

.github/workflows/publish.yml

@@ -16,7 +16,7 @@ jobs:
       matrix:
         target: [universal2-apple-darwin]
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: actions/setup-python@v6
         with:
           python-version: ${{ env.MIN_PYTHON_VERSION }}
@@ -43,7 +43,7 @@ jobs:
       matrix:
         target: [x86_64, x86, aarch64, armv7]
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: actions/setup-python@v6
         with:
           python-version: ${{ env.MIN_PYTHON_VERSION }}
@@ -72,7 +72,7 @@ jobs:
       matrix:
         target: [x64, x86]
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: actions/setup-python@v6
         with:
           python-version: ${{ env.MIN_PYTHON_VERSION }}
@@ -96,7 +96,7 @@ jobs:
   sdist:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Build sdist
         uses: PyO3/maturin-action@v1
         with: