update run commands

Author: chalmerlowe

.github/workflows/lint.yml

@@ -37,12 +37,12 @@ jobs:
         # TODO(https://github.com/googleapis/google-cloud-python/issues/13775): Specify `PY_VERSION` rather than relying on the default python version of the nox session.
         PY_VERSION: "unused"
       run: |
-        ci/run_conditional_tests.sh
+        nox -s lint
     - name: Run lint_setup_py
       env:
         BUILD_TYPE: presubmit
         TEST_TYPE: lint_setup_py
         # TODO(https://github.com/googleapis/google-cloud-python/issues/13775): Specify `PY_VERSION` rather than relying on the default python version of the nox session.
         PY_VERSION: "unused"
       run: |
-        ci/run_conditional_tests.sh
+        nox -s lint_setup_py