chore(deps): update dependency com.google.cloud:google-cloud-retail to v2.0.16 (#380)

* chore(deps): update dependency com.google.cloud:google-cloud-retail to v2.0.16

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retail/interactive-tutorials/pom.xml

@@ -41,7 +41,7 @@
     <dependency>
       <groupId>com.google.cloud</groupId>
       <artifactId>google-cloud-retail</artifactId>
-      <version>2.0.15</version>
+      <version>2.0.16</version>
     </dependency>
     <dependency>
       <groupId>junit</groupId>