deps: update dependency com.google.cloud:google-cloud-datastore-bom to v2.13.6 (#5848)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [com.google.cloud:google-cloud-datastore-bom](https://togithub.com/googleapis/java-datastore) | `2.13.5` -> `2.13.6` | [![age](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-datastore-bom/2.13.6/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-datastore-bom/2.13.6/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-datastore-bom/2.13.6/compatibility-slim/2.13.5)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-datastore-bom/2.13.6/confidence-slim/2.13.5)](https://docs.renovatebot.com/merge-confidence/) |

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### Release Notes

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

### [`v2.13.6`](https://togithub.com/googleapis/java-datastore/blob/HEAD/CHANGELOG.md#&#8203;2136-httpsgithubcomgoogleapisjava-datastorecomparev2135v2136-2023-03-02)

[Compare Source](https://togithub.com/googleapis/java-datastore/compare/v2.13.5...v2.13.6)

##### Dependencies

-   Update dependency com.google.cloud:google-cloud-shared-dependencies to v3.4.0 ([#&#8203;1001](https://togithub.com/googleapis/java-datastore/issues/1001)) ([a230e03](https://togithub.com/googleapis/java-datastore/commit/a230e030fadc11c72f6ced51e566d59439bc1c6e))

</details>

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Author: renovate-bot

google-cloud-bom/pom.xml

@@ -193,7 +193,7 @@
       <dependency>
         <groupId>com.google.cloud</groupId>
         <artifactId>google-cloud-datastore-bom</artifactId>
-        <version>2.13.5</version>
+        <version>2.13.6</version>
         <type>pom</type>
         <scope>import</scope>
       </dependency>