chore(deps): update dependency com.google.cloud:google-cloud-retail to v2.5.1 (googleapis#580)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [com.google.cloud:google-cloud-retail](https://togithub.com/googleapis/java-retail) ([source](https://togithub.com/googleapis/java-)) | `2.5.0` -> `2.5.1` | [![age](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-retail/2.5.1/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-retail/2.5.1/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-retail/2.5.1/compatibility-slim/2.5.0)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-retail/2.5.1/confidence-slim/2.5.0)](https://docs.renovatebot.com/merge-confidence/) |

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Author: renovate-bot

java-retail/README.md

@@ -19,21 +19,21 @@ If you are using Maven, add this to your pom.xml file:
 <dependency>
   <groupId>com.google.cloud</groupId>
   <artifactId>google-cloud-retail</artifactId>
-  <version>2.5.0</version>
+  <version>2.5.1</version>
 </dependency>
 
 ```
 
 If you are using Gradle without BOM, add this to your dependencies:
 
 ```Groovy
-implementation 'com.google.cloud:google-cloud-retail:2.5.0'
+implementation 'com.google.cloud:google-cloud-retail:2.5.1'
 ```
 
 If you are using SBT, add this to your dependencies:
 
 ```Scala
-libraryDependencies += "com.google.cloud" % "google-cloud-retail" % "2.5.0"
+libraryDependencies += "com.google.cloud" % "google-cloud-retail" % "2.5.1"
 ```
 
 ## Authentication

java-retail/samples/install-without-bom/pom.xml

@@ -29,7 +29,7 @@
     <dependency>
       <groupId>com.google.cloud</groupId>
       <artifactId>google-cloud-retail</artifactId>
-      <version>2.5.0</version>
+      <version>2.5.1</version>
     </dependency>
     <!-- [END retail_install_without_bom] -->
 

java-retail/samples/interactive-tutorials/pom.xml

@@ -42,7 +42,7 @@
     <dependency>
       <groupId>com.google.cloud</groupId>
       <artifactId>google-cloud-retail</artifactId>
-      <version>2.5.0</version>
+      <version>2.5.1</version>
     </dependency>
     <dependency>
       <groupId>junit</groupId>

java-retail/samples/snippets/pom.xml

@@ -28,7 +28,7 @@
     <dependency>
       <groupId>com.google.cloud</groupId>
       <artifactId>google-cloud-retail</artifactId>
-      <version>2.5.0</version>
+      <version>2.5.1</version>
     </dependency>
 
     <dependency>