Remove unneeded runtime typing imports (#13233)

utils/bump_version.py

@@ -9,10 +9,12 @@ import sys
 import time
 from contextlib import contextmanager
 from pathlib import Path
-from typing import TYPE_CHECKING, Literal
+from typing import TYPE_CHECKING
 
 if TYPE_CHECKING:
     from collections.abc import Iterator, Sequence
+    from typing import Literal
+
 
 script_dir = Path(__file__).resolve().parent
 package_dir = script_dir.parent