gh-76785: Fix test_threading on Non-Subinterpreter Builds (gh-113014)

gh-112982 broke test_threading on one of the s390 buildbots (Fedora Clang Installed).  Apparently ImportError is raised (rather than ModuleNotFoundError) for the name part of "from" imports.  This fixes that by catching ImportError in test_threading.py.

Author: ericsnowcurrently

Lib/test/test_threading.py

@@ -28,7 +28,7 @@
 
 try:
     from test.support import interpreters
-except ModuleNotFoundError:
+except ImportError:
     interpreters = None
 
 threading_helper.requires_working_threading(module=True)