style: Fix string quote consistency in test_coder.py

Author: paul-gauthier

tests/basic/test_coder.py

@@ -302,7 +302,7 @@ def test_get_file_mentions_various_formats(self):
 
             # Pre-format the Windows path to avoid backslash issues in f-string expressions
             windows_path = test_files[2].replace("/", "\\")
-            win_path3 = test_files[3].replace('/', '\\')
+            win_path3 = test_files[3].replace("/", "\\")
 
             for fname in test_files:
                 fpath = Path(fname)