Update protobuf and spotless gradle plugin (#686)

@@ -12,10 +12,10 @@ buildscript {
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
         classpath "org.jetbrains.kotlin:kotlin-serialization:$kotlin_version"
         classpath "org.jetbrains.dokka:dokka-gradle-plugin:$dokka_version"
-        classpath 'com.google.protobuf:protobuf-gradle-plugin:0.9.3'
+        classpath 'com.google.protobuf:protobuf-gradle-plugin:0.9.5'
         classpath "io.codearte.gradle.nexus:gradle-nexus-staging-plugin:0.30.0"
         classpath 'com.dicedmelon.gradle:jacoco-android:0.1.5'
-        classpath "com.diffplug.spotless:spotless-plugin-gradle:6.21.0"
+        classpath "com.diffplug.spotless:spotless-plugin-gradle:6.23.3"
         // NOTE: Do not place your application dependencies here; they belong
         // in the individual module build.gradle files
     }