chore(deps): bump actions/upload-artifact from 3 to 4

Bumps [actions/upload-artifact](https://github.com/actions/upload-artifact) from 3 to 4.
- [Release notes](https://github.com/actions/upload-artifact/releases)
- [Commits](actions/upload-artifact@v3...v4)

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

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

.github/workflows/pull-request-test.yml

@@ -41,7 +41,7 @@ jobs:
           sphinx-build -nNW -b spelling -d _build/doctrees . _build/spelling
           sphinx-build -qnNW . _build/html
       - name: Upload docs
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         if: success()
         with:
           name: docs

.github/workflows/renku-dev-test.yaml

@@ -37,14 +37,14 @@ jobs:
           working-directory: cypress-tests
       # NOTE: cypress screenshots will be generated only if the test failed
       # thus we store screenshots only on failures
-      - uses: actions/upload-artifact@v3
+      - uses: actions/upload-artifact@v4
         if: failure()
         with:
           name: cypress-screenshots
           path: cypress-tests/cypress/screenshots
           retention-days: 7
       # Cypress test video is always captured, so this action uses "always()" condition
-      - uses: actions/upload-artifact@v3
+      - uses: actions/upload-artifact@v4
         if: always()
         with:
           name: cypress-videos