deps: update dependency com.google.cloud:google-cloud-core to v2.5.0 (#838)

* deps: update dependency com.google.cloud:google-cloud-core to v2.5.0

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dialogflow/snippets/pom.xml

@@ -47,7 +47,7 @@
     <dependency>
       <groupId>com.google.cloud</groupId>
       <artifactId>google-cloud-core</artifactId>
-      <version>2.4.0</version>
+      <version>2.5.0</version>
       <scope>test</scope>
       <classifier>tests</classifier>
     </dependency>