Update project.requires-python to >=3.10 (#15402)

pyproject.toml

@@ -3,7 +3,7 @@
 # https://github.com/astral-sh/uv/issues/8666
 name = "typeshed"
 version = "0"
-requires-python = ">=3.9" # Minimum version to run tests, used by uv run
+requires-python = ">=3.10" # Minimum version to run tests, used by uv run
 
 [tool.black]
 line-length = 130
@@ -147,6 +147,12 @@ extend-safe-fixes = [
     "UP036", # Remove unnecessary `sys.version_info` blocks
 ]
 ignore = [
+    ###
+    # TODO: Disabled temporarily, until Python 3.9 support is fully removed in
+    # May 2026.
+    ###
+    "UP035", # import from typing
+    "UP036", # Remove unnecessary `sys.version_info` blocks
     ###
     # Rules that can conflict with the formatter (Black)
     # https://docs.astral.sh/ruff/formatter/#conflicting-lint-rules

stdlib/_collections_abc.pyi

@@ -1,7 +1,7 @@
 import sys
 from abc import abstractmethod
 from types import MappingProxyType
-from typing import (  # noqa: Y022,Y038,UP035,Y057
+from typing import (  # noqa: Y022,Y038,UP035,Y057,RUF100
     AbstractSet as Set,
     AsyncGenerator as AsyncGenerator,
     AsyncIterable as AsyncIterable,

stdlib/builtins.pyi

@@ -37,7 +37,7 @@ from types import CellType, CodeType, GenericAlias, TracebackType
 
 # mypy crashes if any of {ByteString, Sequence, MutableSequence, Mapping, MutableMapping}
 # are imported from collections.abc in builtins.pyi
-from typing import (  # noqa: Y022,UP035
+from typing import (  # noqa: Y022,UP035,RUF100
     IO,
     Any,
     BinaryIO,

stdlib/typing_extensions.pyi

@@ -30,7 +30,7 @@ from collections.abc import (
 from contextlib import AbstractAsyncContextManager as AsyncContextManager, AbstractContextManager as ContextManager
 from re import Match as Match, Pattern as Pattern
 from types import GenericAlias, ModuleType
-from typing import (  # noqa: Y022,Y037,Y038,Y039,UP035
+from typing import (  # noqa: Y022,Y037,Y038,Y039,UP035,RUF100
     IO as IO,
     TYPE_CHECKING as TYPE_CHECKING,
     AbstractSet as AbstractSet,