Replace abs paths in tracebacks for win tests

Co-authored-by: Ali Hamdan <ali.hamdan.dev@gmail.com>

Author: cdce8p

mypyc/test/test_run.py

@@ -314,6 +314,7 @@ def run_case_step(self, testcase: DataDrivenTestCase, incremental_step: int) ->
             # TODO: testDecorators1 hangs on 3.12, remove this once fixed
             proc.wait(timeout=30)
         output = proc.communicate()[0].decode("utf8")
+        output = output.replace(f'  File "{os.getcwd()}{os.sep}', '  File "')
         outlines = output.splitlines()
 
         if testcase.config.getoption("--mypyc-showc"):