deps: update dependency com.google.cloud:google-cloud-shared-dependencies to v2.5.1 (#744)

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This PR contains the following updates:

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

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### Release Notes

<details>
<summary>googleapis/java-shared-dependencies</summary>

### [`v2.5.1`](https://togithub.com/googleapis/java-shared-dependencies/blob/master/CHANGELOG.md#&#8203;251-httpswwwgithubcomgoogleapisjava-shared-dependenciescompare250v251-2021-12-03)

[Compare Source](https://togithub.com/googleapis/java-shared-dependencies/compare/v2.5.0...v2.5.1)

</details>

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README.md

@@ -27,6 +27,11 @@ If you are using Maven with [BOM][libraries-bom], add this to your pom.xml file
 </dependencyManagement>
 
 <dependencies>
+  <dependency>
+      <groupId>org.json</groupId>
+      <artifactId>json</artifactId>
+      <version>20210307</version>
+  </dependency>
   <dependency>
     <groupId>com.google.cloud</groupId>
     <artifactId>google-cloud-speech</artifactId>

pom.xml

@@ -185,7 +185,7 @@
       <dependency>
         <groupId>com.google.cloud</groupId>
         <artifactId>google-cloud-shared-dependencies</artifactId>
-        <version>2.5.0</version>
+        <version>2.5.1</version>
         <type>pom</type>
         <scope>import</scope>
       </dependency>