[pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

Author: pre-commit-ci[bot]

cheroot/server.py

@@ -1876,7 +1876,7 @@ def _serve_unservicable(self):
                 return
             request = HTTPRequest(self, conn)
             try:
-                request.simple_response("503 Service Unavailable")
+                request.simple_response('503 Service Unavailable')
             except Exception as ex:
                 self.server.error_log(
                     repr(ex),

cheroot/test/test_server.py

@@ -576,12 +576,15 @@ def test_overload_results_in_503(request):
     """A server that can't keep up with requests returns a 503 HTTP error."""
     httpserver = HTTPServer(
         bind_addr=(ANY_INTERFACE_IPV4, EPHEMERAL_PORT),
-        gateway=Gateway
+        gateway=Gateway,
     )
     # Can only handle on request in parallel:
     httpserver.requests = ThreadPool(
-        min=1, max=1, accepted_queue_size=1,
-        accepted_queue_timeout=0, server=httpserver
+        min=1,
+        max=1,
+        accepted_queue_size=1,
+        accepted_queue_timeout=0,
+        server=httpserver,
     )
 
     httpserver.prepare()
@@ -598,5 +601,5 @@ def test_overload_results_in_503(request):
     sock2 = socket.socket()
     sock2.connect((host, port))
 
-    response = requests.get(f"http://{host}:{port}", timeout=5)
+    response = requests.get(f'http://{host}:{port}', timeout=5)
     assert response.status_code == 503