fixup: remove remove unused alias in code

testing/test_reports.py

@@ -1,6 +1,7 @@
 # mypy: allow-untyped-defs
+from __future__ import annotations
+
 from typing import Sequence
-from typing import Union
 
 from _pytest._code.code import ExceptionChainRepr
 from _pytest._code.code import ExceptionRepr
@@ -294,8 +295,8 @@ class TestReportSerialization:
 
         reprec = pytester.inline_run()
         if report_class is TestReport:
-            reports: Union[Sequence[TestReport], Sequence[CollectReport]] = (
-                reprec.getreports("pytest_runtest_logreport")
+            reports: Sequence[TestReport] | Sequence[CollectReport] = reprec.getreports(
+                "pytest_runtest_logreport"
             )
             # we have 3 reports: setup/call/teardown
             assert len(reports) == 3