Replaced `Config.workdir` with `Config.get_workdir()`.

Again, Python < 3.9 doesn't like class properties.

platypush/config/__init__.py

@@ -498,8 +498,7 @@ class Config:
         return cfg
 
     @classmethod
-    @property
-    def workdir(cls) -> str:
+    def get_workdir(cls) -> str:
         """
         :return: The path of the configured working directory.
         """

platypush/plugins/xmpp/__init__.py

@@ -117,7 +117,7 @@ class XmppPlugin(AsyncRunnablePlugin, XmppBasePlugin):
             auto_accept_invites=auto_accept_invites,
             restore_state=restore_state,
             state_file=os.path.expanduser(
-                state_file or os.path.join(Config.workdir, 'xmpp', 'state.json')
+                state_file or os.path.join(Config.get_workdir(), 'xmpp', 'state.json')
             ),
         )
         self._loaded_state = SerializedState()

platypush/utils/__init__.py

@@ -523,7 +523,7 @@ def get_or_generate_jwt_rsa_key_pair():
     """
     from platypush.config import Config
 
-    key_dir = os.path.join(Config.workdir, 'jwt')
+    key_dir = os.path.join(Config.get_workdir(), 'jwt')
     priv_key_file = os.path.join(key_dir, 'id_rsa')
     pub_key_file = priv_key_file + '.pub'