Add explicit grpc-util dependency for ssl sample

Author: mjameswh

core/build.gradle

@@ -8,6 +8,7 @@ dependencies {
     implementation "io.temporal:temporal-envconfig:$javaSDKVersion"
 
     // Needed for SDK related functionality
+    implementation "io.grpc:grpc-util"
     implementation(platform("com.fasterxml.jackson:jackson-bom:2.17.2"))
     implementation "com.fasterxml.jackson.core:jackson-databind"
     implementation "com.fasterxml.jackson.core:jackson-core"