fixup: remove remove unused alias in code

testing/test_assertrewrite.py

@@ -1,4 +1,6 @@
 # mypy: allow-untyped-defs
+from __future__ import annotations
+
 import ast
 import errno
 from functools import partial
@@ -12,12 +14,8 @@ import stat
 import sys
 import textwrap
 from typing import cast
-from typing import Dict
 from typing import Generator
-from typing import List
 from typing import Mapping
-from typing import Optional
-from typing import Set
 from unittest import mock
 import zipfile
 
@@ -45,13 +43,13 @@ def rewrite(src: str) -> ast.Module:
 
 
 def getmsg(
-    f, extra_ns: Optional[Mapping[str, object]] = None, *, must_pass: bool = False
-) -> Optional[str]:
+    f, extra_ns: Mapping[str, object] | None = None, *, must_pass: bool = False
+) -> str | None:
     """Rewrite the assertions in f, run it, and get the failure message."""
     src = "\n".join(_pytest._code.Code.from_function(f).source().lines)
     mod = rewrite(src)
     code = compile(mod, "<test>", "exec")
-    ns: Dict[str, object] = {}
+    ns: dict[str, object] = {}
     if extra_ns is not None:
         ns.update(extra_ns)
     exec(code, ns)
@@ -1639,8 +1637,8 @@ class TestEarlyRewriteBailout:
         """
         import importlib.machinery
 
-        self.find_spec_calls: List[str] = []
-        self.initial_paths: Set[Path] = set()
+        self.find_spec_calls: list[str] = []
+        self.initial_paths: set[Path] = set()
 
         class StubSession:
             _initialpaths = self.initial_paths
@@ -2060,7 +2058,7 @@ class TestReprSizeVerbosity:
     )
     def test_get_maxsize_for_saferepr(self, verbose: int, expected_size) -> None:
         class FakeConfig:
-            def get_verbosity(self, verbosity_type: Optional[str] = None) -> int:
+            def get_verbosity(self, verbosity_type: str | None = None) -> int:
                 return verbose
 
         config = FakeConfig()