CI: use auto-cache for test_models (#31171)

use auto cache
old-commit-hash: 6262de4419

.github/workflows/selfdrive_tests.yaml

@@ -321,7 +321,7 @@ jobs:
     - uses: ./.github/workflows/setup-with-retry
     - name: Cache test routes
       id: dependency-cache
-      uses: actions/cache@v3
+      uses: ./.github/workflows/auto-cache
       with:
         path: .ci_cache/comma_download_cache
         key: car_models-${{ hashFiles('selfdrive/car/tests/test_models.py', 'selfdrive/car/tests/routes.py') }}-${{ matrix.job }}