Remove PytestReturnNotNoneWarning (#51327)

Author: gopidesupavan

airflow-ctl/pyproject.toml

@@ -163,7 +163,6 @@ norecursedirs = [
 log_level = "INFO"
 filterwarnings = [
     "error::pytest.PytestCollectionWarning",
-    "error::pytest.PytestReturnNotNoneWarning",
 ]
 python_files = [
     "test_*.py",

pyproject.toml

@@ -881,7 +881,6 @@ norecursedirs = [
 log_level = "INFO"
 filterwarnings = [
     "error::pytest.PytestCollectionWarning",
-    "error::pytest.PytestReturnNotNoneWarning",
     # Avoid building cartesian product which might impact performance
     "error:SELECT statement has a cartesian product between FROM:sqlalchemy.exc.SAWarning:airflow",
     'error:Coercing Subquery object into a select\(\) for use in IN\(\):sqlalchemy.exc.SAWarning:airflow',

task-sdk/pyproject.toml

@@ -199,7 +199,6 @@ norecursedirs = [
 log_level = "INFO"
 filterwarnings = [
     "error::pytest.PytestCollectionWarning",
-    "error::pytest.PytestReturnNotNoneWarning",
 ]
 python_files = [
     "test_*.py",