ci: Use docker compose v2

The docker-compose is no longer available in checkout@v2. Use the v2
`docker compose` instead.

Author: tbabej

Makefile

@@ -3,7 +3,7 @@ export LC_ALL := en_US.UTF-8
 PYTHON ?= python3
 
 test:
-	docker-compose run --rm tests make xvfb-cover-pytest
+	docker compose run --rm tests make xvfb-cover-pytest
 
 pytest:
 	$(PYTHON) -m pytest -vv $(PYTEST_FLAGS) tests/