tests: Update pom.

Author: blakeli0

java-showcase/pom.xml

@@ -46,11 +46,6 @@
         <artifactId>proto-gapic-showcase-v1beta1</artifactId>
         <version>0.0.1-SNAPSHOT</version>
       </dependency>
-      <dependency>
-        <groupId>com.google.api.grpc</groupId>
-        <artifactId>proto-gapic-showcase-v1beta1</artifactId>
-        <version>0.0.1-SNAPSHOT-3.25.8</version>
-      </dependency>
       <dependency>
         <groupId>com.google.api.grpc</groupId>
         <artifactId>grpc-gapic-showcase-v1beta1</artifactId>