Disable pylint too-many-branches check for update method

The update() method has nested match statements that result in 21
branches, exceeding pylint 4.0's default limit of 12. This is
intentional for handling various field update cases.

Signed-off-by: Mathias L. Baumann <[email protected]>

Author: Marenz

src/frequenz/client/dispatch/_client.py

@@ -367,7 +367,7 @@ async def create(  # pylint: disable=too-many-positional-arguments
 
         return Dispatch.from_protobuf(response.dispatch)
 
-    async def update(
+    async def update(  # pylint: disable=too-many-branches
         self,
         *,
         microgrid_id: MicrogridId,