Apply ruff/refurb rule (FURB129)

FURB129 Instead of calling `readlines()`, iterate over file object directly

Author: DimitriPapadopoulos

distutils/tests/test_msvc9compiler.py

@@ -161,7 +161,7 @@ def test_remove_visual_c_ref(self):
         f = open(manifest)
         try:
             # removing trailing spaces
-            content = '\n'.join([line.rstrip() for line in f.readlines()])
+            content = '\n'.join([line.rstrip() for line in f])
         finally:
             f.close()