changing credentials type annotation as suggested by issue #1207

Author: alejcas

O365/account.py

@@ -8,7 +8,7 @@
 class Account:
     connection_constructor: Type = Connection  #: :meta private:
 
-    def __init__(self, credentials: Tuple[str, str], *,
+    def __init__(self, credentials: str | tuple[str, str], *,
                  username: Optional[str] = None,
                  protocol: Optional[Protocol] = None,
                  main_resource: Optional[str] = None, **kwargs):

O365/connection.py

@@ -366,7 +366,7 @@ class Connection:
 
     def __init__(
         self,
-        credentials: tuple,
+        credentials: str | tuple[str, str],
         *,
         proxy_server: Optional[str] = None,
         proxy_port: Optional[int] = 8080,