Remove unused tmate

Author: GreyElaina

.github/workflows/ci.yaml

@@ -209,9 +209,6 @@ jobs:
                   uv run pytest tests
               env:
                   MATURIN_PEP517_ARGS: "--profile=dev"
-            - name: tmate session if tests fail
-              if: failure()
-              uses: mxschmitt/action-tmate@v3
             - name: Run mypy
               working-directory: api/python/slint
               run: uv run mypy -p tests -p slint