Remove pin on transitive dependency typing.inspect.

Add pin for marshmallow_dataclass>=8.5.9 which has been fixed
to work with latest typing.inspect.

Ref: #1058, 9e7a3ce, and 949d9d8.

setup.cfg

@@ -45,18 +45,13 @@ install_requires =
     Jinja2>=3.0
     MarkupSafe
     marshmallow
-    marshmallow_dataclass
+    marshmallow_dataclass>=8.5.9
     mistune>=0.7.0,<3
     pip
     python-slugify
     pytz
     requests
     setuptools
-    # Temporary (hopefully) fix for breakage of marshmallow_dataclass
-    # by latest typing.inspect.
-    #
-    # See https://github.com/lovasoa/marshmallow_dataclass/issues/206
-    typing-inspect < 0.8.0
     watchdog
     Werkzeug>=2.1.0,<3