build(deps): update dependency org.apache.maven.plugins:maven-javadoc-plugin to v3.4.0 (#984)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [org.apache.maven.plugins:maven-javadoc-plugin](https://maven.apache.org/plugins/) | `3.3.2` -> `3.4.0` | [![age](https://badges.renovateapi.com/packages/maven/org.apache.maven.plugins:maven-javadoc-plugin/3.4.0/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/maven/org.apache.maven.plugins:maven-javadoc-plugin/3.4.0/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/maven/org.apache.maven.plugins:maven-javadoc-plugin/3.4.0/compatibility-slim/3.3.2)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/org.apache.maven.plugins:maven-javadoc-plugin/3.4.0/confidence-slim/3.3.2)](https://docs.renovatebot.com/merge-confidence/) |

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README.md

@@ -19,20 +19,20 @@ If you are using Maven, add this to your pom.xml file:
 <dependency>
   <groupId>com.google.cloud</groupId>
   <artifactId>google-cloud-translate</artifactId>
-  <version>2.1.12</version>
+  <version>2.1.13</version>
 </dependency>
 ```
 
 If you are using Gradle without BOM, add this to your dependencies
 
 ```Groovy
-implementation 'com.google.cloud:google-cloud-translate:2.1.12'
+implementation 'com.google.cloud:google-cloud-translate:2.1.13'
 ```
 
 If you are using SBT, add this to your dependencies
 
 ```Scala
-libraryDependencies += "com.google.cloud" % "google-cloud-translate" % "2.1.12"
+libraryDependencies += "com.google.cloud" % "google-cloud-translate" % "2.1.13"
 ```
 
 ## Authentication

pom.xml

@@ -170,7 +170,7 @@
       <plugin>
         <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-javadoc-plugin</artifactId>
-        <version>3.3.2</version>
+        <version>3.4.0</version>
         <reportSets>
           <reportSet>
             <id>html</id>