remove redundant version marker

version is derived from Spring DM definition for protoc

Author: OlegDokuka

build.gradle

@@ -76,7 +76,11 @@ subprojects {
 
         dependencies {
 
-            dependency "com.google.protobuf:protobuf-java:${ext['protobuf.version']}"
+            dependencySet(group: 'com.google.protobuf', version: ext['protobuf.version']) {
+                entry 'protobuf-java'
+                entry 'protoc'
+            }
+            dependency "com.google.protobuf:protoc:${ext['protobuf.version']}"
 
             dependency "javax.inject:javax.inject:1"
 		  	dependency "javax.annotation:javax.annotation-api:1.2"

rsocket-rpc-core/build.gradle

@@ -42,7 +42,7 @@ protobuf {
     generatedFilesBaseDir = "${projectDir}/src/generated"
 
     protoc {
-        artifact = "com.google.protobuf:protoc:${ext['protobuf.version']}"
+        artifact = "com.google.protobuf:protoc"
     }
     plugins {
         rsocketRpc {

rsocket-rpc-metrics-idl/build.gradle

@@ -2,7 +2,7 @@ description = 'RSocket RPC Metrics IDL'
 
 protobuf {
     protoc {
-        artifact = 'com.google.protobuf:protoc:3.6.1'
+        artifact = 'com.google.protobuf:protoc'
     }
     generateProtoTasks {
         all().each { task ->

rsocket-rpc-protobuf-idl/build.gradle

@@ -6,7 +6,7 @@ description = 'RSocket RPC Protobf IDL'
 
 protobuf {
     protoc {
-        artifact = "com.google.protobuf:protoc:${ext['protobuf.version']}"
+        artifact = "com.google.protobuf:protoc"
     }
     generateProtoTasks {
         all().each { task ->

rsocket-rpc-protobuf/build.gradle

@@ -22,7 +22,7 @@ protobuf {
     generatedFilesBaseDir = "${projectDir}/src/generated"
 
     protoc {
-        artifact = "com.google.protobuf:protoc:${ext['protobuf.version']}"
+        artifact = "com.google.protobuf:protoc"
     }
     plugins {
         rsocketRpc {