refactor(crypto): Remove GroupSessionCache::get as it is unused

Author: kaylendog

crates/matrix-sdk-crypto/src/session_manager/group_sessions/mod.rs

@@ -117,16 +117,6 @@ impl GroupSessionCache {
         }
     }
 
-    /// Get an outbound group session for a room, if one exists.
-    ///
-    /// # Arguments
-    ///
-    /// * `room_id` - The id of the room for which we should get the outbound
-    ///   group session.
-    fn get(&self, room_id: &RoomId) -> Option<OutboundGroupSession> {
-        self.sessions.read().get(room_id).cloned()
-    }
-
     /// Returns whether any session is withheld with the given device and code.
     fn has_session_withheld_to(&self, device: &DeviceData, code: &WithheldCode) -> bool {
         self.sessions.read().values().any(|s| s.sharing_view().is_withheld_to(device, code))