deps: update dependency com.google.cloud:google-cloud-shared-dependencies to v2.13.0 (#777)

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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) | `2.12.0` -> `2.13.0` | [![age](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-shared-dependencies/2.13.0/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-shared-dependencies/2.13.0/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-shared-dependencies/2.13.0/compatibility-slim/2.12.0)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-shared-dependencies/2.13.0/confidence-slim/2.12.0)](https://docs.renovatebot.com/merge-confidence/) |

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Author: renovate-bot

README.md

@@ -56,13 +56,13 @@ implementation 'com.google.cloud:google-cloud-datastore'
 If you are using Gradle without BOM, add this to your dependencies
 
 ```Groovy
-implementation 'com.google.cloud:google-cloud-datastore:2.8.0'
+implementation 'com.google.cloud:google-cloud-datastore:2.9.0'
 ```
 
 If you are using SBT, add this to your dependencies
 
 ```Scala
-libraryDependencies += "com.google.cloud" % "google-cloud-datastore" % "2.8.0"
+libraryDependencies += "com.google.cloud" % "google-cloud-datastore" % "2.9.0"
 ```
 
 ## Authentication

pom.xml

@@ -151,7 +151,7 @@
       <dependency>
         <groupId>com.google.cloud</groupId>
         <artifactId>google-cloud-shared-dependencies</artifactId>
-        <version>2.12.0</version>
+        <version>2.13.0</version>
         <type>pom</type>
         <scope>import</scope>
       </dependency>