gifn-apply: use Ruff's isort implementation

Change-Id: I9a8254a643916a7fb2a035bd2cfcac4370316c0c
diff --git a/tools/git-if-needed/python/gifn_apply/git.py b/tools/git-if-needed/python/gifn_apply/git.py
index f33c1a1..5336e7d 100644
--- a/tools/git-if-needed/python/gifn_apply/git.py
+++ b/tools/git-if-needed/python/gifn_apply/git.py
@@ -5,14 +5,13 @@
 from __future__ import annotations
 
 import subprocess  # noqa: S404
-
 from typing import TYPE_CHECKING
 
 from . import defs
 
+
 if TYPE_CHECKING:
     import pathlib
-
     from typing import Final