Build: Bump actions/checkout from 5 to 6

Bumps [actions/checkout](https://github.com/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
...

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

Author: dependabot[bot]

.github/workflows/license_check.yml

@@ -24,5 +24,5 @@ jobs:
   rat:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
     - run: dev/check-license

.github/workflows/nightly-pypi-build.yml

@@ -31,7 +31,7 @@ jobs:
     outputs:
       VERSION: ${{ steps.set-version.outputs.VERSION }}
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           fetch-depth: 1
 

.github/workflows/pypi-build-artifacts.yml

@@ -35,7 +35,7 @@ jobs:
         os: [ ubuntu-latest, windows-latest, macos-latest ]
 
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           fetch-depth: 1
 

.github/workflows/python-ci-docs.yml

@@ -35,7 +35,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: actions/setup-python@v6
         with:
           python-version: 3.12

.github/workflows/python-ci.yml

@@ -50,7 +50,7 @@ jobs:
         python: ['3.10', '3.11', '3.12']
 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
     - uses: actions/setup-python@v6
       with:
         python-version: ${{ matrix.python }}
@@ -74,7 +74,7 @@ jobs:
         python: ['3.10', '3.11', '3.12']
 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
     - uses: actions/setup-python@v6
       with:
         python-version: ${{ matrix.python }}

.github/workflows/python-release-docs.yml

@@ -30,7 +30,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: actions/setup-python@v6
         with:
           python-version: ${{ matrix.python }}

.github/workflows/python-release.yml

@@ -89,7 +89,7 @@ jobs:
     needs:
       - validate-inputs
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           fetch-depth: 1
 

.github/workflows/svn-build-artifacts.yml

@@ -35,7 +35,7 @@ jobs:
         os: [ ubuntu-latest, windows-latest, macos-latest ]
 
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           fetch-depth: 1