💚 ci(deps): bump pdm-project/setup-pdm from 3 to 4

Bumps [pdm-project/setup-pdm](https://github.com/pdm-project/setup-pdm) from 3 to 4.
- [Release notes](https://github.com/pdm-project/setup-pdm/releases)
- [Commits](pdm-project/setup-pdm@v3...v4)

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

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

.github/workflows/pythonpublish.yml

@@ -16,6 +16,6 @@ jobs:
       id-token: write
     steps:
       - uses: actions/checkout@v3
-      - uses: pdm-project/setup-pdm@v3
+      - uses: pdm-project/setup-pdm@v4
       - name: Publish package distributions to PyPI
         run: pdm publish