Update protobuf monorepo to v4

Author: renovate[bot]

gradle/libs.versions.toml

@@ -15,7 +15,7 @@
 [versions]
 kotlin = "2.1.20"
 okhttp = "3.14.9"
-protobuf = "3.25.7"
+protobuf = "4.30.2"
 robovm = "2.3.14"
 kotlinx-serialization = "1.8.1"
 autoService = "1.1.1"