deps: update dependency com.google.cloud:google-iam-policy to v1.6.20 (…

…#554)

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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)) | `1.6.19` -> `1.6.20` | [![age](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-iam-policy/1.6.20/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-iam-policy/1.6.20/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-iam-policy/1.6.20/compatibility-slim/1.6.19)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-iam-policy/1.6.20/confidence-slim/1.6.19)](https://docs.renovatebot.com/merge-confidence/) |

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### Release Notes

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

### [`v1.6.20`](https://togithub.com/googleapis/java-iam/blob/HEAD/CHANGELOG.md#&#8203;1620-httpsgithubcomgoogleapisjava-iamcomparev1619v1620-2022-11-22)

[Compare Source](https://togithub.com/googleapis/java-iam/compare/v1.6.19...v1.6.20)

##### Dependencies

-   Update dependency com.google.cloud:google-iam-policy to v1.6.19 ([#&#8203;551](https://togithub.com/googleapis/java-iam/issues/551)) ([a9b48d9](https://togithub.com/googleapis/java-iam/commit/a9b48d9c9ac5a2150a8c8f21f6cc476caed5f78c))

</details>

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java-iam/samples/cloud-client/snippets/pom.xml

@@ -41,7 +41,7 @@
     <dependency>
       <groupId>com.google.cloud</groupId>
       <artifactId>google-iam-policy</artifactId>
-      <version>1.6.19</version>
+      <version>1.6.20</version>
       <scope>compile</scope>
     </dependency>
     <dependency>