Don't ignore UP038, the rule has been removed and ignoring has no effect

Author: hugovk

Tools/build/.ruff.toml

@@ -29,7 +29,6 @@ ignore = [
     "F541",    # f-string without any placeholders
     "PYI024",  # Use `typing.NamedTuple` instead of `collections.namedtuple`
     "PYI025",  # Use `from collections.abc import Set as AbstractSet`
-    "UP038",   # Use `X | Y` in `isinstance` call instead of `(X, Y)`
 ]
 
 [lint.per-file-ignores]

Tools/clinic/.ruff.toml

@@ -17,9 +17,6 @@ ignore = [
     # Use f-strings instead of format specifiers.
     # Doesn't always make code more readable.
     "UP032",
-    # Use PEP-604 unions rather than tuples for isinstance() checks.
-    # Makes code slower and more verbose. https://github.com/astral-sh/ruff/issues/7871.
-    "UP038",
 ]
 unfixable = [
     # The autofixes sometimes do the wrong things for these;

Tools/peg_generator/.ruff.toml

@@ -13,11 +13,6 @@ select = [
     "RUF100",  # Ban unused `# noqa` comments
     "PGH004",  # Ban blanket `# noqa` comments (only ignore specific error codes)
 ]
-ignore = [
-    # Use PEP-604 unions rather than tuples for isinstance() checks.
-    # Makes code slower and more verbose. https://github.com/astral-sh/ruff/issues/7871.
-    "UP038",
-]
 unfixable = [
     # The autofixes sometimes do the wrong things for these;
     # it's better to have to manually look at the code and see how it needs fixing