gnatcheck_driver.py: Remove a forgotten debug print

Author: HugoGGuerrier

testsuite/drivers/gnatcheck_driver.py

@@ -687,7 +687,6 @@ def parse_flagged_lines(self, output: str, format: str) -> dict[str, TaggedLines
 
     @property
     def output_refiners(self) -> list[OutputRefiner]:
-        print(self.working_dir())
         result = []
         # Canonicalize gnatcheck worker name in the output before applying
         # base_driver refiners.