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/main.yml

@@ -20,7 +20,7 @@ jobs:
   lint:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
     - name: Set up Python 3.12
       uses: actions/setup-python@v6
       with:
@@ -44,7 +44,7 @@ jobs:
             python-version: '3.12'
     runs-on: ${{ matrix.os }}
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
       with:
         fetch-depth: 0 # fetch all history for all branches, required for the changed-files action
     - uses: actions/cache@v4

.github/workflows/scheduled_or_manual.yml

@@ -21,7 +21,7 @@ jobs:
   lint:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
     - name: Set up Python 3.12
       uses: actions/setup-python@v6
       with:
@@ -46,7 +46,7 @@ jobs:
         inputs: ["00_ or 01_ or 02_ or 03_ or 04_ or 05_ or 10_ or 20_ or 21_ or 22_ or 300_ or 30_ or 31_ or 32_ or 33_ or 34_ or 35_ or 36_", "51_ or 55_ or 56_ or 60_ or 61_ or 62_ or 63_ or 64_", "65_ or 66_ or 67_ or 68_ or 69_ or 70_ or 71_"]
     runs-on: ${{ matrix.os }}
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
     - uses: actions/cache@v4
       id: cache
       with: