deps: update dependency com.google.cloud:google-iam-policy to v1.6.20 (#554)

[![Mend Renovate](https://app.renovatebot.com/images/banner.svg)](https://renovatebot.com) 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/) | --- ### 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)) ([cd4a411](https://togithub.com/googleapis/java-iam/commit/cd4a411647e67ebe88c690d6ca4532d4011b4029)) </details> --- ### Configuration 📅 **Schedule**: Branch creation - At any time (no schedule defined), Automerge - At any time (no schedule defined). 🚦 **Automerge**: Disabled by config. Please merge this manually once you are satisfied. ♻ **Rebasing**: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox. 🔕 **Ignore**: Close this PR and you won't be reminded about this update again. --- - [ ] <!-- rebase-check -->If you want to rebase/retry this PR, check this box --- This PR has been generated by [Mend Renovate](https://www.mend.io/free-developer-tools/renovate/). View repository job log [here](https://app.renovatebot.com/dashboard#github/googleapis/java-iam). <!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiIzNC4zMC4yIiwidXBkYXRlZEluVmVyIjoiMzQuMzAuMiJ9-->

Author: renovate-bot

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>