deps: update google.common-protos.version to v2.8.1 (#656)

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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-common-protos) | `2.8.0` -> `2.8.1` | [![age](https://badges.renovateapi.com/packages/maven/com.google.api.grpc:grpc-google-common-protos/2.8.1/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/maven/com.google.api.grpc:grpc-google-common-protos/2.8.1/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/maven/com.google.api.grpc:grpc-google-common-protos/2.8.1/compatibility-slim/2.8.0)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/com.google.api.grpc:grpc-google-common-protos/2.8.1/confidence-slim/2.8.0)](https://docs.renovatebot.com/merge-confidence/) |
| [com.google.api.grpc:proto-google-common-protos](https://togithub.com/googleapis/java-common-protos) | `2.8.0` -> `2.8.1` | [![age](https://badges.renovateapi.com/packages/maven/com.google.api.grpc:proto-google-common-protos/2.8.1/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/maven/com.google.api.grpc:proto-google-common-protos/2.8.1/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/maven/com.google.api.grpc:proto-google-common-protos/2.8.1/compatibility-slim/2.8.0)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/com.google.api.grpc:proto-google-common-protos/2.8.1/confidence-slim/2.8.0)](https://docs.renovatebot.com/merge-confidence/) |

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### Release Notes

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

### [`v2.8.1`](https://togithub.com/googleapis/java-common-protos/blob/HEAD/CHANGELOG.md#&#8203;281-httpsgithubcomgoogleapisjava-common-protoscomparev280v281-2022-04-07)

[Compare Source](https://togithub.com/googleapis/java-common-protos/compare/v2.8.0...v2.8.1)

</details>

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first-party-dependencies/pom.xml

@@ -61,7 +61,7 @@
     <guava.version>31.1-jre</guava.version>
     <protobuf.version>3.20.0</protobuf.version>
     <google.api-common.version>2.1.5</google.api-common.version>
-    <google.common-protos.version>2.8.0</google.common-protos.version>
+    <google.common-protos.version>2.8.1</google.common-protos.version>
     <google.core.version>2.5.11</google.core.version>
     <google.auth.version>1.6.0</google.auth.version>
     <google.http-client.version>1.41.6</google.http-client.version>