refactor: update kotlin

gradle.properties

@@ -4,7 +4,7 @@ org.gradle.jvmargs=-Xmx8g
 
 gradlePluginVersion=7.3.1
 googleServicesVersion=4.3.12
-kotlinVersion=1.6.21
+kotlinVersion=1.7.20
 coroutinesVersion=1.6.4
 kotlinxJsonVersion=1.3.3
 lifecycleVersion=2.5.1

libsession/src/main/java/org/session/libsession/messaging/sending_receiving/pollers/OpenGroupPoller.kt

@@ -81,6 +81,7 @@ class OpenGroupPoller(private val server: String, private val executorService: S
                     is Endpoint.Outbox, is Endpoint.OutboxSince -> {
                         handleDirectMessages(server, true, response.body as List<OpenGroupApi.DirectMessage>)
                     }
+                    else -> { /* We don't care about the result of any other calls (won't be polled for) */}
                 }
                 if (secondToLastJob == null && !isCaughtUp) {
                     isCaughtUp = true

libsession/src/main/java/org/session/libsession/messaging/utilities/UpdateMessageBuilder.kt

@@ -73,6 +73,7 @@ object UpdateMessageBuilder {
                     context.getString(R.string.ConversationItem_group_action_left, senderName)
                 }
             }
+            is UpdateMessageData.Kind.OpenGroupInvitation -> { /*Handled externally*/ }
         }
         return message
     }