deps: update dependency io.grafeas:grafeas to v2.4.0 (#4668)

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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) | `2.3.1` -> `2.4.0` | [![age](https://badges.renovateapi.com/packages/maven/io.grafeas:grafeas/2.4.0/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/maven/io.grafeas:grafeas/2.4.0/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/maven/io.grafeas:grafeas/2.4.0/compatibility-slim/2.3.1)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/io.grafeas:grafeas/2.4.0/confidence-slim/2.3.1)](https://docs.renovatebot.com/merge-confidence/) |

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### Release Notes

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

### [`v2.4.0`](https://togithub.com/googleapis/java-grafeas/blob/HEAD/CHANGELOG.md#&#8203;240-httpsgithubcomgoogleapisjava-grafeascomparev231v240-2022-06-30)

[Compare Source](https://togithub.com/googleapis/java-grafeas/compare/v2.3.1...v2.4.0)

##### Features

-   Enable REST transport for most of Java and Go clients ([22be2f6](https://togithub.com/googleapis/java-grafeas/commit/22be2f68312a23b82e9441e8a9da933a4b85fa87))
-   Import of Grafeas from Github ([22be2f6](https://togithub.com/googleapis/java-grafeas/commit/22be2f68312a23b82e9441e8a9da933a4b85fa87))

##### Bug Fixes

-   Set the transport of grafeas back to grpc only ([#&#8203;498](https://togithub.com/googleapis/java-grafeas/issues/498)) ([22be2f6](https://togithub.com/googleapis/java-grafeas/commit/22be2f68312a23b82e9441e8a9da933a4b85fa87))

</details>

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Author: renovate-bot

google-cloud-bom/pom.xml

@@ -909,7 +909,7 @@
       <dependency>
         <groupId>io.grafeas</groupId>
         <artifactId>grafeas</artifactId>
-        <version>2.3.1</version>
+        <version>2.4.0</version>
       </dependency>
     </dependencies>
   </dependencyManagement>