deps: update google.core.version to v2.9.4 (#976)

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This PR contains the following updates:

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

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### Release Notes

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

### [`v2.9.4`](https://togithub.com/googleapis/java-core/blob/HEAD/CHANGELOG.md#&#8203;294-httpsgithubcomgoogleapisjava-corecomparev293v294-2023-01-20)

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

##### Bug Fixes

-   **java:** Skip fixing poms for special modules ([#&#8203;1744](https://togithub.com/googleapis/java-core/issues/1744)) ([#&#8203;1080](https://togithub.com/googleapis/java-core/issues/1080)) ([db2cc2f](https://togithub.com/googleapis/java-core/commit/db2cc2fcd03342948c6c4e753d012d08000e7733))

</details>

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Author: renovate-bot

first-party-dependencies/pom.xml

@@ -58,7 +58,7 @@
     <gapic-generator-java-bom.version>2.14.0</gapic-generator-java-bom.version>
     <grpc-gcp.version>1.3.2</grpc-gcp.version>
     <gson.version>2.10.1</gson.version>
-    <google.core.version>2.9.3</google.core.version>
+    <google.core.version>2.9.4</google.core.version>
     <google.http-client.version>1.42.3</google.http-client.version>
     <google.oauth-client.version>1.34.1</google.oauth-client.version>
     <google.api-client.version>2.1.2</google.api-client.version>