Bump actions/checkout from 4.1.7 to 4.2.1

Bumps [actions/checkout](https://github.com/actions/checkout) from 4.1.7 to 4.2.1.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v4.1.7...v4.2.1)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

.github/workflows/pythonpackage.yml

@@ -8,7 +8,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout sources
-        uses: actions/checkout@v4.1.7
+        uses: actions/checkout@v4.2.1
       - name: Set up Python
         uses: actions/[email protected]
         with:
@@ -25,7 +25,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout sources
-        uses: actions/checkout@v4.1.7
+        uses: actions/checkout@v4.2.1
       - name: Set up Python
         uses: actions/[email protected]
         with:
@@ -50,7 +50,7 @@ jobs:
         python-version: ["3.8", "3.9", "3.10", "3.11", "3.12", "3.13"]
     steps:
       - name: Checkout sources
-        uses: actions/checkout@v4.1.7
+        uses: actions/checkout@v4.2.1
       - name: Set up Python ${{ matrix.python-version }}
         uses: actions/[email protected]
         with:
@@ -77,7 +77,7 @@ jobs:
     needs: test
     steps:
       - name: Checkout sources
-        uses: actions/checkout@v4.1.7
+        uses: actions/checkout@v4.2.1
       - name: Set up Python
         uses: actions/[email protected]
         with:

.github/workflows/pythonpublish.yml

@@ -8,7 +8,7 @@ jobs:
   deploy:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v4.1.7
+    - uses: actions/checkout@v4.2.1
     - name: Set up Python
       uses: actions/[email protected]
       with: