Replace non UTF-8 characters from tests outputs | refs #32250

tester.py

@@ -335,7 +335,7 @@ class Tester:
                     stdout=subprocess.PIPE,
                     stderr=subprocess.STDOUT,
                 )
-                out = p.stdout.decode("utf-8").strip()
+                out = p.stdout.decode("utf-8", "replace").strip()
                 log(out)
                 if p.returncode in (0, 2, 3):
                     break