deps: update dependency com.google.cloud:google-cloud-shared-dependencies to v0.15.0 (#344)

Author: stephaniewang526

pom.xml

@@ -96,7 +96,7 @@
       <dependency>
         <groupId>com.google.cloud</groupId>
         <artifactId>google-cloud-shared-dependencies</artifactId>
-        <version>0.13.0</version>
+        <version>0.15.0</version>
         <type>pom</type>
         <scope>import</scope>
       </dependency>
@@ -216,4 +216,4 @@
       </plugin>
     </plugins>
   </reporting>
-</project>
+</project>