tagging: import NotRequired from typing_extensions

NotRequired is not available in python3.9.

src/antsibull/tagging.py

@@ -14,7 +14,7 @@
 import re
 import sys
 from collections.abc import AsyncGenerator, Collection
-from typing import NotRequired, TextIO, TypedDict
+from typing import TYPE_CHECKING, TextIO, TypedDict
 
 import asyncio_pool  # type: ignore[import]
 from antsibull_core import app_context
@@ -24,6 +24,9 @@
 
 from antsibull.collection_meta import CollectionMetadata, CollectionsMetadata
 
+if TYPE_CHECKING:
+    from typing_extensions import NotRequired
+
 TAG_MATCHER: re.Pattern[str] = re.compile(r"^.*refs/tags/(.*)$")
 TAG_VERSION_REGEX: re.Pattern[str] = re.compile(r"^v?(.*)$")
 mlog = log.fields(mod=__name__)