Update CI to use new ruff output argument

.github/workflows/lint-test.yaml

@@ -23,7 +23,7 @@ jobs:
 
       # Run `ruff` using github formatting to enable automatic inline annotations.
       - name: Run ruff
-        run: "ruff check --format=github ."
+        run: "ruff check --output-format=github ."
 
       - name: Run tests and generate coverage report
         run: python -m pytest -n auto --cov pydis_core -q