gh-115282: Fix direct invocation of test_traceback.py

[sobolevn]

After:

» ./python.exe Lib/test/test_traceback.py
..................................................................................................................................................................................................................................................................................................................................................
----------------------------------------------------------------------
Ran 338 tests in 2.104s

OK

» ./python.exe -m test test_traceback
Using random seed: 3645079937
0:00:00 load avg: 2.51 Run 1 test sequentially
0:00:00 load avg: 2.51 [1/1] test_traceback

== Tests result: SUCCESS ==

1 test OK.

Total duration: 1.1 sec
Total tests: run=338 skipped=1
Total test files: run=1/1
Result: SUCCESS

• Issue: Direct invocation of test_traceback.py fails #115282

[sobolevn]

This does not need a backport, because the change is rather new: 2c68011 (3.13 only)

[sobolevn]

Thanks everyone!