Bump actions/checkout from 6 to 7 (#217)

Bumps [actions/checkout](https://github.com/actions/checkout) from 6 to 7.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v6...v7)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: '7'
  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/build.yml

@@ -29,7 +29,7 @@ jobs:
       PYTHON_VERSION: ${{ matrix.python-version }}
 
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@v7
         with:
           submodules: recursive
       - uses: prefix-dev/setup-pixi@v0.9.6
@@ -66,7 +66,7 @@ jobs:
       USE_BLAS64: ${{ matrix.use_blas64 }}
 
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@v7
         with:
           submodules: recursive
 
@@ -113,7 +113,7 @@ jobs:
         native_arch: [true, false]
 
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@v7
         with:
           submodules: recursive
       - uses: prefix-dev/setup-pixi@v0.9.6
@@ -145,7 +145,7 @@ jobs:
         python-version: [ "3.10", "3.11", "3.12", "3.13", "3.14" ]
 
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@v7
         with:
           submodules: recursive
       - uses: prefix-dev/setup-pixi@v0.9.6
@@ -182,7 +182,7 @@ jobs:
             arch: auto
 
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@v7
         with:
           submodules: true
 
@@ -229,7 +229,7 @@ jobs:
     name: Build source distribution
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@v7
         with:
           submodules: true
 

.github/workflows/freethreading_tests.yml

@@ -15,7 +15,7 @@ jobs:
         python-version: ["3.13t", "3.14t"]
 
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@v7
         with:
           submodules: recursive
 
@@ -65,7 +65,7 @@ jobs:
             cflags: "-fsanitize=address -g"
 
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@v7
         with:
           submodules: recursive