Merge branch 'pytest-migration' into 'master'

Deprecation warning fix in test_iohelper.py

Closes #378

See merge request lhcb/LHCb!4974

GaudiConf/tests/pytest/test_iohelper.py

@@ -27,5 +27,5 @@ class Test(LHCbExeTest):
         we must artificially hide some differences
         """
         preprocessor = LHCbExeTest.preprocessor + RegexpReplacer(
-            r"\[.*/([^/]*.*)\]", r"[\1]", "^\[Gaudi"
+            r"\[.*/([^/]*.*)\]", r"[\1]", r"^\[Gaudi"
         )