build(deps): bump actions/upload-artifact from 3 to 4 (#62)

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] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/ci.yml

@@ -220,7 +220,7 @@ jobs:
           cp -f ./.readthedocs.yaml ./python-plexapi/.readthedocs.yml
 
       - name: Upload artifacts
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: python-plexapi-backport
           if-no-files-found: error  # 'warn' or 'ignore' are also available, defaults to `warn`
@@ -260,7 +260,7 @@ jobs:
           python setup.py sdist bdist_wheel
 
       - name: Upload artifacts
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: dist
           if-no-files-found: error  # 'warn' or 'ignore' are also available, defaults to `warn`
@@ -441,7 +441,7 @@ jobs:
           python -u tools/plex-teardowntest.py
 
       - name: Upload coverage artifact
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: coverage-${{ matrix.plex }}-${{ matrix.python }}
           path: .coverage