deps: update dependency com.google.cloud:google-iam-policy to v1.6.6 (#492)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [com.google.cloud:google-iam-policy](https://togithub.com/googleapis/java-eventarc) ([source](https://togithub.com/googleapis/java-iam)) | `1.6.5` -> `1.6.6` | [![age](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-iam-policy/1.6.6/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-iam-policy/1.6.6/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-iam-policy/1.6.6/compatibility-slim/1.6.5)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-iam-policy/1.6.6/confidence-slim/1.6.5)](https://docs.renovatebot.com/merge-confidence/) |

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### Release Notes

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

### [`v1.6.6`](https://togithub.com/googleapis/java-iam/blob/HEAD/CHANGELOG.md#&#8203;166-httpsgithubcomgoogleapisjava-iamcomparev165v166-2022-10-25)

[Compare Source](https://togithub.com/googleapis/java-iam/compare/v1.6.5...v1.6.6)

##### Dependencies

-   Update dependency com.google.cloud:google-iam-policy to v1.6.5 ([#&#8203;489](https://togithub.com/googleapis/java-iam/issues/489)) ([ab8be40](https://togithub.com/googleapis/java-iam/commit/ab8be4088259b25799aa5df0e7cfe944a7da7956))

</details>

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Author: renovate-bot

iam/cloud-client/snippets/pom.xml

@@ -41,7 +41,7 @@
     <dependency>
       <groupId>com.google.cloud</groupId>
       <artifactId>google-iam-policy</artifactId>
-      <version>1.6.5</version>
+      <version>1.6.6</version>
       <scope>compile</scope>
     </dependency>
     <dependency>