chore(deps): update dependency com.google.cloud:google-cloud-datastore to v2.2.8 (#678)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [com.google.cloud:google-cloud-datastore](https://togithub.com/googleapis/java-datastore) | `2.2.7` -> `2.2.8` | [![age](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-datastore/2.2.8/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-datastore/2.2.8/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-datastore/2.2.8/compatibility-slim/2.2.7)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-datastore/2.2.8/confidence-slim/2.2.7)](https://docs.renovatebot.com/merge-confidence/) |

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### Release Notes

<details>
<summary>googleapis/java-datastore</summary>

### [`v2.2.8`](https://togithub.com/googleapis/java-datastore/blob/HEAD/CHANGELOG.md#&#8203;228-httpsgithubcomgoogleapisjava-datastorecomparev227v228-2022-03-10)

[Compare Source](https://togithub.com/googleapis/java-datastore/compare/v2.2.7...v2.2.8)

</details>

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Author: renovate-bot

README.md

@@ -41,7 +41,7 @@ If you are using Maven without BOM, add this to your dependencies:
 <dependency>
   <groupId>com.google.cloud</groupId>
   <artifactId>google-cloud-datastore</artifactId>
-  <version>2.2.7</version>
+  <version>2.2.8</version>
 </dependency>
 
 ```

samples/install-without-bom/pom.xml

@@ -29,7 +29,7 @@
     <dependency>
       <groupId>com.google.cloud</groupId>
       <artifactId>google-cloud-datastore</artifactId>
-      <version>2.2.7</version>
+      <version>2.2.8</version>
     </dependency>
     <!-- [END datastore_install_without_bom] -->
 

samples/snapshot/pom.xml

@@ -28,7 +28,7 @@
     <dependency>
       <groupId>com.google.cloud</groupId>
       <artifactId>google-cloud-datastore</artifactId>
-      <version>2.2.7</version>
+      <version>2.2.8</version>
     </dependency>
 
     <dependency>