ci(dependabot): bump aganders3/headless-gui from 1 to 2

Bumps [aganders3/headless-gui](https://github.com/aganders3/headless-gui) from 1 to 2.
- [Release notes](https://github.com/aganders3/headless-gui/releases)
- [Commits](aganders3/headless-gui@v1...v2)

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

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

.github/workflows/ci.yml

@@ -51,7 +51,7 @@ jobs:
           python -m pip install .[test] ${{ github.event_name == 'schedule' && '--pre' || ''  }}
 
       - name: Test
-        uses: aganders3/headless-gui@v1
+        uses: aganders3/headless-gui@v2
         with:
           run: pytest --color=yes --cov --cov-report=xml --cov-report=term-missing