Update protobuf monorepo to v4.30.0 (#59)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

build.gradle.kts

@@ -27,7 +27,7 @@ tasks {
 description = "Java Bindings for the OpenTelemetry Protocol (OTLP)"
 
 val grpcVersion = "1.70.0"
-val protobufVersion = "4.29.3"
+val protobufVersion = "4.30.0"
 
 repositories {
   mavenCentral()