Group protobuf deps into one PR (#389)

Author: breedx-splk

.github/renovate.json5

@@ -24,6 +24,10 @@
       "matchPackagePrefixes": ["ch.qos.logback:"],
       "groupName": "logback packages"
     },
+    {
+      "matchPackagePrefixes": ["com.google.protobuf"],
+      "groupName": "protobuf packages"
+    },
     {
       // intentionally using Spring Boot 2 in some examples
       "matchPackageNames": ["org.springframework.boot"],