Remove the rest of Union usages by hand

These require some manual changes.

bin/tests/system/isctest/log/watchlog.py

@@ -9,7 +9,8 @@
 # See the COPYRIGHT file distributed with this work for additional
 # information regarding copyright ownership.
 
-from typing import Any, Match, Optional, Pattern, TextIO, TypeVar, Union
+
+from typing import Any, Match, Optional, Pattern, TextIO, TypeAlias, TypeVar
 
 import abc
 import os
@@ -18,7 +19,7 @@ import time
 from isctest.text import FlexPattern, LineReader, compile_pattern
 
 T = TypeVar("T")
-OneOrMore = Union[T, list[T]]
+OneOrMore: TypeAlias = T | list[T]
 
 
 class WatchLogException(Exception):

bin/tests/system/isctest/text.py

@@ -12,12 +12,12 @@
 # information regarding copyright ownership.
 
 from re import compile as Re
-from typing import Iterator, Match, Optional, Pattern, TextIO, Union
+from typing import Iterator, Match, Optional, Pattern, TextIO
 
 import abc
 import re
 
-FlexPattern = Union[str, Pattern]
+FlexPattern = str | Pattern
 
 
 def compile_pattern(string: FlexPattern) -> Pattern:

pyproject.toml

@@ -98,6 +98,7 @@ lint.select = [
   "RUF022",
   # unnecessary `typing` imports
   "UP006",
+  "UP007",
   # f-strings
   "UP031",
   "UP032",