Bump the actions group across 1 directory with 2 updates

Bumps the actions group with 2 updates in the / directory: [actions/setup-python](https://github.com/actions/setup-python) and [actions/upload-artifact](https://github.com/actions/upload-artifact).


Updates `actions/setup-python` from 5 to 6
- [Release notes](https://github.com/actions/setup-python/releases)
- [Commits](actions/setup-python@v5...v6)

Updates `actions/upload-artifact` from 4 to 5
- [Release notes](https://github.com/actions/upload-artifact/releases)
- [Commits](actions/upload-artifact@v4...v5)

---
updated-dependencies:
- dependency-name: actions/setup-python
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: actions
- dependency-name: actions/upload-artifact
  dependency-version: '5'
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: actions
...

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

Author: dependabot[bot]

.github/workflows/main.yaml

@@ -11,7 +11,7 @@ jobs:
       - uses: actions/checkout@v5
         with:
           persist-credentials: false
-      - uses: actions/setup-python@v5
+      - uses: actions/setup-python@v6
       - uses: pre-commit/action@2c7b3805fd2a0fd8c1884dcaebf91fc102a13ecd # v3.0.1
   build:
     runs-on: ubuntu-latest
@@ -22,7 +22,7 @@ jobs:
       - uses: actions/checkout@v5
         with:
           persist-credentials: false
-      - uses: actions/setup-python@v5
+      - uses: actions/setup-python@v6
         with:
           python-version: "3.10"
       - name: Install dependencies
@@ -61,15 +61,15 @@ jobs:
       - name: Run checks
         run: |
           make check
-      - uses: actions/upload-artifact@v4
+      - uses: actions/upload-artifact@v5
         if: ${{ always() }}
         with:
           name: build
           path: |
             cheatsheets.pdf
             handout-*.pdf
             ./docs/_build/html/
-      - uses: actions/upload-artifact@v4
+      - uses: actions/upload-artifact@v5
         id: diffs-artifact-upload
         if: ${{ always() }}
         with: