deps: update dependency com.google.protobuf:protobuf-bom to v3.12.2 (#116)

Author: renovate-bot

pom.xml

@@ -99,7 +99,7 @@
  <dependency>
  <groupId>com.google.protobuf</groupId>
  <artifactId>protobuf-bom</artifactId>
- <version>3.12.1</version>
+ <version>3.12.2</version>
  <type>pom</type>
  <scope>import</scope>
  </dependency>