deps: update dependency io.grafeas:grafeas to v2.2.4 (#4199)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [io.grafeas:grafeas](https://togithub.com/googleapis/java-grafeas) | `2.2.3` -> `2.2.4` | [![age](https://badges.renovateapi.com/packages/maven/io.grafeas:grafeas/2.2.4/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/maven/io.grafeas:grafeas/2.2.4/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/maven/io.grafeas:grafeas/2.2.4/compatibility-slim/2.2.3)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/io.grafeas:grafeas/2.2.4/confidence-slim/2.2.3)](https://docs.renovatebot.com/merge-confidence/) |

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### Release Notes

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

### [`v2.2.4`](https://togithub.com/googleapis/java-grafeas/blob/HEAD/CHANGELOG.md#&#8203;224-httpsgithubcomgoogleapisjava-grafeascomparev223v224-2022-04-15)

[Compare Source](https://togithub.com/googleapis/java-grafeas/compare/v2.2.3...v2.2.4)

</details>

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pom.xml

@@ -888,7 +888,7 @@
       <dependency>
         <groupId>io.grafeas</groupId>
         <artifactId>grafeas</artifactId>
-        <version>2.2.3</version>
+        <version>2.2.4</version>
       </dependency>
     </dependencies>
   </dependencyManagement>