Fix KeyError: 'name' in python/extractor/imp.py on Python 3.14

Follow-up to #20630

The fix didn't fully work since when we raise the ImportError in `find_module` we don't pass a named argument into the format string which causes a `KeyError`.

We need to use a format string without named arguments, like Python 3.13 and earlier did.

Author: akoeplinger

python/extractor/imp.py

@@ -25,7 +25,7 @@
     from importlib._bootstrap import _ERR_MSG
 except ImportError:
     from importlib._bootstrap import _ERR_MSG_PREFIX
-    _ERR_MSG = _ERR_MSG_PREFIX + '{name!r}'
+    _ERR_MSG = _ERR_MSG_PREFIX + '{!r}'
 
 from importlib import machinery
 from importlib import util