Bump actions/setup-python from 3 to 5

Bumps [actions/setup-python](https://github.com/actions/setup-python) from 3 to 5.
- [Release notes](https://github.com/actions/setup-python/releases)
- [Commits](actions/setup-python@v3...v5)

---
updated-dependencies:
- dependency-name: actions/setup-python
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

.github/workflows/main.yml

@@ -16,7 +16,7 @@ jobs:
         run: |
           sudo apt-get install pandoc
       - name: Set up Python
-        uses: actions/setup-python@v3
+        uses: actions/setup-python@v5
         with:
           python-version: 3.8
       - name: Install RTD requirements