update the bouncy castle version

Author: Federico2014

build.gradle

@@ -76,7 +76,7 @@ dependencies {
     compile group: 'io.grpc', name: 'grpc-stub', version: '1.9.0'
 
     compile group: 'com.googlecode.protobuf-java-format', name: 'protobuf-java-format', version: '1.4'
-    compile group: 'org.bouncycastle', name: 'bcprov-jdk15on', version: '1.68'
+    compile group: 'org.bouncycastle', name: 'bcprov-jdk15on', version: '1.69'
     compile group: 'com.typesafe', name: 'config', version: '1.3.2'
     compile "com.google.code.findbugs:jsr305:3.0.0"
     compile "org.springframework.cloud:spring-cloud-starter-consul-discovery:${springCloudConsulVersion}"