Use type hinting generics in standard collections (#19046)

aka PEP 585, added in Python 3.9

 - https://peps.python.org/pep-0585/
 - https://docs.astral.sh/ruff/rules/non-pep585-annotation/

tests/http/__init__.py

@@ -19,7 +19,6 @@
 #
 import os.path
 import subprocess
-from typing import List
 
 from incremental import Version
 from zope.interface import implementer
@@ -85,7 +84,7 @@ subjectAltName = %(sanentries)s
 """
 
 
-def create_test_cert_file(sanlist: List[bytes]) -> str:
+def create_test_cert_file(sanlist: list[bytes]) -> str:
     """build an x509 certificate file
 
     Args:
@@ -151,7 +150,7 @@ class TestServerTLSConnectionFactory:
     """An SSL connection creator which returns connections which present a certificate
     signed by our test CA."""
 
-    def __init__(self, sanlist: List[bytes]):
+    def __init__(self, sanlist: list[bytes]):
         """
         Args:
             sanlist: a list of subjectAltName values for the cert
@@ -166,7 +165,7 @@ class TestServerTLSConnectionFactory:
 
 
 def wrap_server_factory_for_tls(
-    factory: IProtocolFactory, clock: IReactorTime, sanlist: List[bytes]
+    factory: IProtocolFactory, clock: IReactorTime, sanlist: list[bytes]
 ) -> TLSMemoryBIOFactory:
     """Wrap an existing Protocol Factory with a test TLSMemoryBIOFactory