deps: update google.core.version to v2.6.1 (#671)

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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) | `2.6.0` -> `2.6.1` | [![age](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-core/2.6.1/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-core/2.6.1/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-core/2.6.1/compatibility-slim/2.6.0)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-core/2.6.1/confidence-slim/2.6.0)](https://docs.renovatebot.com/merge-confidence/) |
| [com.google.cloud:google-cloud-core-bom](https://togithub.com/googleapis/java-core) | `2.6.0` -> `2.6.1` | [![age](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-core-bom/2.6.1/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-core-bom/2.6.1/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-core-bom/2.6.1/compatibility-slim/2.6.0)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-core-bom/2.6.1/confidence-slim/2.6.0)](https://docs.renovatebot.com/merge-confidence/) |

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### Release Notes

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

### [`v2.6.1`](https://togithub.com/googleapis/java-core/blob/HEAD/CHANGELOG.md#&#8203;261-httpsgithubcomgoogleapisjava-corecomparev260v261-2022-04-14)

[Compare Source](https://togithub.com/googleapis/java-core/compare/v2.6.0...v2.6.1)

</details>

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first-party-dependencies/pom.xml

@@ -62,7 +62,7 @@
     <protobuf.version>3.19.4</protobuf.version>
     <google.api-common.version>2.1.5</google.api-common.version>
     <google.common-protos.version>2.8.3</google.common-protos.version>
-    <google.core.version>2.6.0</google.core.version>
+    <google.core.version>2.6.1</google.core.version>
     <google.auth.version>1.6.0</google.auth.version>
     <google.http-client.version>1.41.7</google.http-client.version>
     <google.oauth-client.version>1.33.3</google.oauth-client.version>