Bump actions/checkout from 4 to 6 (#156)

Author: dependabot[bot]

.github/workflows/release.yml

@@ -9,7 +9,7 @@ jobs:
     name: Check style
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v6
     - uses: chartboost/ruff-action@v1
     - uses: chartboost/ruff-action@v1
       with:
@@ -22,7 +22,7 @@ jobs:
     permissions:
       id-token: write
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v6
     - name: Install uv
       uses: astral-sh/setup-uv@v7
       with:

.github/workflows/test.yml

@@ -13,7 +13,7 @@ jobs:
     name: Check style
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v6
     - uses: astral-sh/ruff-action@v3
     - uses: astral-sh/ruff-action@v3
       with:
@@ -27,7 +27,7 @@ jobs:
     name: Run tests (Python ${{ matrix.python-version }})
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v6
     - name: Install uv
       uses: astral-sh/setup-uv@v7
     - name: Build