deps: update dependency com.google.api.grpc:grpc-google-common-protos to v2.9.4 (#906)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [com.google.api.grpc:grpc-google-common-protos](https://togithub.com/googleapis/java-iam/grpc-google-common-protos) ([source](https://togithub.com/googleapis/java-common-protos)) | `2.9.3` -> `2.9.4` | [![age](https://badges.renovateapi.com/packages/maven/com.google.api.grpc:grpc-google-common-protos/2.9.4/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/maven/com.google.api.grpc:grpc-google-common-protos/2.9.4/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/maven/com.google.api.grpc:grpc-google-common-protos/2.9.4/compatibility-slim/2.9.3)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/com.google.api.grpc:grpc-google-common-protos/2.9.4/confidence-slim/2.9.3)](https://docs.renovatebot.com/merge-confidence/) |

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### Release Notes

<details>
<summary>googleapis/java-common-protos</summary>

### [`v2.9.4`](https://togithub.com/googleapis/java-common-protos/blob/HEAD/CHANGELOG.md#&#8203;294-httpsgithubcomgoogleapisjava-common-protoscomparev293v294-2022-09-28)

[Compare Source](https://togithub.com/googleapis/java-common-protos/compare/v2.9.3...v2.9.4)

##### Dependencies

-   Update dependency certifi to v2022.9.24 ([#&#8203;418](https://togithub.com/googleapis/java-common-protos/issues/418)) ([40f5dec](https://togithub.com/googleapis/java-common-protos/commit/40f5decf9cab5294b1e3d7622fd15beb6c5f34c5))
-   Update dependency charset-normalizer to v2.1.1 ([#&#8203;420](https://togithub.com/googleapis/java-common-protos/issues/420)) ([db48320](https://togithub.com/googleapis/java-common-protos/commit/db48320fb793522eb57dddab71576b6851d09bf4))
-   Update dependency googleapis-common-protos to v1.56.4 ([#&#8203;419](https://togithub.com/googleapis/java-common-protos/issues/419)) ([ca70ae5](https://togithub.com/googleapis/java-common-protos/commit/ca70ae5b1d7f9c2d3f2a631074acd7e80873f552))

</details>

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Author: renovate-bot

java-document-ai/google-cloud-document-ai/pom.xml

@@ -128,7 +128,7 @@
     <dependency>
       <groupId>com.google.api.grpc</groupId>
       <artifactId>grpc-google-common-protos</artifactId>
-      <version>2.9.3</version>
+      <version>2.9.4</version>
       <scope>test</scope>
     </dependency>
   </dependencies>