Simplify mypy settings (#12823)

pyproject.toml

@@ -196,22 +196,12 @@ exclude = [
     "^tests/test_util/typing_test_data\\.py$",
     # tests/test_writers
 ]
-check_untyped_defs = true
 python_version = "3.10"
+strict = true
 show_column_numbers = true
 show_error_context = true
-strict_optional = true
-warn_redundant_casts = true
-warn_unused_configs = true
-warn_unused_ignores = true
-disallow_any_generics = true
-disallow_incomplete_defs = true
-disallow_subclassing_any = true
-disallow_untyped_calls = true
-disallow_untyped_decorators = true
-disallow_untyped_defs = true
-no_implicit_reexport = true
-extra_checks = true
+strict_equality = false
+warn_return_any = false
 enable_error_code = [
     "type-arg",
     "redundant-self",