ci: fix cache key for test_models (#34230)

* fix this

* please rerun this my good ci friend

* thank you very much

.github/workflows/selfdrive_tests.yaml

@@ -231,7 +231,7 @@ jobs:
       uses: actions/cache@v4
       with:
         path: .ci_cache/comma_download_cache
-        key: car_models-${{ hashFiles('selfdrive/car/tests/test_models.py', 'selfdrive/car/tests/routes.py') }}-${{ matrix.job }}
+        key: car_models-${{ hashFiles('selfdrive/car/tests/test_models.py', 'opendbc/car/tests/routes.py') }}-${{ matrix.job }}
     - name: Build openpilot
       run: ${{ env.RUN }} "scons -j$(nproc)"
     - name: Test car models