deps: update dependency com.google.cloud:google-cloud-core to v1.94.8 (…

…#528)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [com.google.cloud:google-cloud-core](https://github.com/googleapis/java-core) | `1.94.7` -> `1.94.8` | [![age](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-core/1.94.8/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-core/1.94.8/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-core/1.94.8/compatibility-slim/1.94.7)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-core/1.94.8/confidence-slim/1.94.7)](https://docs.renovatebot.com/merge-confidence/) |

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### Release Notes

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

### [`v1.94.8`](https://github.com/googleapis/java-core/blob/master/CHANGELOG.md#&#8203;1948-httpswwwgithubcomgoogleapisjava-corecomparev1947v1948-2021-04-23)

[Compare Source](https://github.com/googleapis/java-core/compare/v1.94.7...v1.94.8)

</details>

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dialogflow/snippets/pom.xml

@@ -47,7 +47,7 @@
     <dependency>
       <groupId>com.google.cloud</groupId>
       <artifactId>google-cloud-core</artifactId>
-      <version>1.94.7</version>
+      <version>1.94.8</version>
       <scope>test</scope>
       <classifier>tests</classifier>
     </dependency>