tests: drop unused import

Author: xrmx

tests/contrib/asyncio/starlette_tests.py

@@ -28,8 +28,6 @@
 #  OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 #  OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-from shutil import ExecError
-
 from tests.fixtures import TempStoreClient
 
 import pytest  # isort:skip