fix: restore Python 3.7 support

Signed-off-by: Henry Schreiner <henryschreineriii@gmail.com>

cibuildwheel/options.py

@@ -22,12 +22,12 @@ else:
 
 from packaging.specifiers import SpecifierSet
 
+from ._compat.typing import PLATFORMS, Literal, NotRequired, PlatformName, TypedDict
 from .architecture import Architecture
 from .environment import EnvironmentParseError, ParsedEnvironment, parse_environment
 from .logger import log
 from .oci_container import ContainerEngine
 from .projectfiles import get_requires_python_str
-from .typing import PLATFORMS, Literal, NotRequired, PlatformName, TypedDict
 from .util import (
     MANYLINUX_ARCHS,
     MUSLLINUX_ARCHS,