tests: Replace umodule with module everywhere.

This work was funded through GitHub Sponsors.

Signed-off-by: Jim Mussared <jim.mussared@gmail.com>

tests/basics/sys_exit.py

@@ -1,10 +1,6 @@
 # test sys module's exit function
 
-try:
-    import usys as sys
-except ImportError:
-    import sys
-
+import sys
 try:
     sys.exit
 except AttributeError: