deps: update dependency com.google.cloud:google-iam-policy to v1.6.3 (#472)

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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)) | `1.6.2` -> `1.6.3` | [![age](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-iam-policy/1.6.3/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-iam-policy/1.6.3/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-iam-policy/1.6.3/compatibility-slim/1.6.2)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-iam-policy/1.6.3/confidence-slim/1.6.2)](https://docs.renovatebot.com/merge-confidence/) |

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### Release Notes

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

### [`v1.6.3`](https://togithub.com/googleapis/java-iam/blob/HEAD/CHANGELOG.md#&#8203;163-httpsgithubcomgoogleapisjava-iamcomparev162v163-2022-10-07)

[Compare Source](https://togithub.com/googleapis/java-iam/compare/v1.6.2...v1.6.3)

##### Dependencies

-   Update dependency com.google.cloud:google-cloud-shared-dependencies to v3.0.4 ([#&#8203;468](https://togithub.com/googleapis/java-iam/issues/468)) ([f6be604](https://togithub.com/googleapis/java-iam/commit/f6be6047506561a7b6f1dc5b5ea925207075d3ac))
-   Update dependency com.google.cloud:google-iam-policy to v1.6.2 ([#&#8203;467](https://togithub.com/googleapis/java-iam/issues/467)) ([0af193b](https://togithub.com/googleapis/java-iam/commit/0af193bbcedcfa7e7e9b53eaeb509fba5df974b3))

</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>1.6.2</version>
+      <version>1.6.3</version>
       <scope>compile</scope>
     </dependency>
     <dependency>