deps: update dependency com.google.protobuf:protobuf-bom to v3.11.4 (#30)

Author: renovate-bot

pom.xml

@@ -97,7 +97,7 @@
       <dependency>
         <groupId>com.google.protobuf</groupId>
         <artifactId>protobuf-bom</artifactId>
-        <version>3.11.1</version>
+        <version>3.11.4</version>
         <type>pom</type>
         <scope>import</scope>
       </dependency>