Bump actions/checkout from 4 to 6 (#12)

Bumps [actions/checkout](https://github.com/actions/checkout) from 4 to 6.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v4...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>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/ci.yml

@@ -13,7 +13,7 @@ jobs:
     name: Check code quality
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - uses: actions/setup-python@v5
         with:
           python-version: "3.12"
@@ -32,7 +32,7 @@ jobs:
         target: [x86_64, i686]
         python-version: ["3.10", "3.11", "3.12", "3.13", "3.14"]
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - uses: actions/setup-python@v5
         with:
           python-version: "${{ matrix.python-version }}"
@@ -62,7 +62,7 @@ jobs:
       matrix:
         target: [aarch64, armv7, ppc64le]
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - uses: actions/setup-python@v5
         with:
           python-version: "3.12"
@@ -102,7 +102,7 @@ jobs:
           - x86_64-unknown-linux-musl
           - i686-unknown-linux-musl
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - uses: actions/setup-python@v5
         with:
           python-version: "3.12"
@@ -142,7 +142,7 @@ jobs:
           - target: armv7-unknown-linux-musleabihf
             arch: armv7
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - uses: actions/setup-python@v5
         with:
           python-version: "3.12"
@@ -178,7 +178,7 @@ jobs:
             os: windows-11-arm
             interpreter: "3.13"
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - uses: actions/setup-python@v5
         with:
           python-version: "${{ matrix.platform.interpreter }}"
@@ -210,7 +210,7 @@ jobs:
           - { i: "3.9 3.10 3.11 3.12 3.13 3.14", py: "3.9" }
           - { i: "pypy3.11 pypy3.11 3.11 3.12 3.13 3.14", py: "pypy3.11" }
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - uses: actions/setup-python@v5
         with:
           python-version: "${{ matrix.py.py }}"
@@ -241,7 +241,7 @@ jobs:
     name: Source Distribution
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - name: Build sdist
         uses: PyO3/maturin-action@v1
         with:
@@ -289,7 +289,7 @@ jobs:
     if: "startsWith(github.ref, 'refs/tags/')"
     needs: [release]
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - name: Build and publish docs
         run: |
           pip install -r requirements.txt

.github/workflows/codspeed.yml

@@ -16,7 +16,7 @@ jobs:
     name: Run benchmarks
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - name: Setup Python
         uses: actions/setup-python@v5
         with: