ci(dependabot): bump aganders3/headless-gui from 2.1 to 2.2 (#37)

Bumps [aganders3/headless-gui](https://github.com/aganders3/headless-gui) from 2.1 to 2.2.
- [Release notes](https://github.com/aganders3/headless-gui/releases)
- [Commits](aganders3/headless-gui@v2.1...v2.2)

---
updated-dependencies:
- dependency-name: aganders3/headless-gui
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

.github/workflows/ci.yml

@@ -69,7 +69,7 @@ jobs:
           python -m pip install pyqt6
 
       - name: Run test
-        uses: aganders3/headless-gui@v2.1
+        uses: aganders3/headless-gui@v2.2
         with:
           run: pytest -v --cov=cmap --cov-report=xml --cov-report=term-missing