Use git.types.Literal instead of typing.Literal

Author: George-Ogden

git/diff.py

@@ -21,7 +21,6 @@
     Any,
     Iterator,
     List,
-    Literal,
     Match,
     Optional,
     Sequence,
@@ -31,7 +30,7 @@
     Union,
     cast,
 )
-from git.types import PathLike
+from git.types import PathLike, Literal
 
 if TYPE_CHECKING:
     from subprocess import Popen
@@ -291,7 +290,7 @@ class DiffIndex(List[T_Diff]):
     The class improves the diff handling convenience.
     """
 
-    change_type: Sequence[Literal["A", "C", "D", "R", "M", "T"]] = ("A", "C", "D", "R", "M", "T")
+    change_type: Sequence[Literal["A", "C", "D", "R", "M", "T"]] = ("A", "C", "D", "R", "M", "T")  # noqa: F821
     """Change type invariant identifying possible ways a blob can have changed:
 
     * ``A`` = Added