deps: update dependency com.google.cloud:google-iam-policy to v1.6.8 (#509)

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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)) | `1.6.7` -> `1.6.8` | [![age](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-iam-policy/1.6.8/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-iam-policy/1.6.8/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-iam-policy/1.6.8/compatibility-slim/1.6.7)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-iam-policy/1.6.8/confidence-slim/1.6.7)](https://docs.renovatebot.com/merge-confidence/) |

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### Release Notes

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

### [`v1.6.8`](https://togithub.com/googleapis/java-iam/blob/HEAD/CHANGELOG.md#&#8203;168-httpsgithubcomgoogleapisjava-iamcomparev167v168-2022-11-08)

[Compare Source](https://togithub.com/googleapis/java-iam/compare/v1.6.7...v1.6.8)

##### Dependencies

-   Update dependency com.google.cloud:google-cloud-shared-dependencies to v3.0.6 ([#&#8203;506](https://togithub.com/googleapis/java-iam/issues/506)) ([23e1a8d](https://togithub.com/googleapis/java-iam/commit/23e1a8d609cc8c6a0dc22d7bc3086a4587d2faa5))
-   Update dependency com.google.cloud:google-iam-policy to v1.6.7 ([#&#8203;502](https://togithub.com/googleapis/java-iam/issues/502)) ([b877e43](https://togithub.com/googleapis/java-iam/commit/b877e43c6908af2c6c7d28fdbc154a403dc64fd0))

</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>1.6.7</version>
+      <version>1.6.8</version>
       <scope>compile</scope>
     </dependency>
     <dependency>