Remove vulnerable dependency

pom.xml

@@ -101,6 +101,12 @@
       <groupId>io.grpc</groupId>
       <artifactId>grpc-netty-shaded</artifactId>
       <version>${grpc.version}</version>
+      <exclusions>
+        <exclusion>  <!-- declare the exclusion here -->
+          <groupId>com.google.guava</groupId>
+          <artifactId>guava</artifactId>
+        </exclusion>
+      </exclusions>
     </dependency>
     <dependency>
       <groupId>com.google.api.grpc</groupId>