deps: update iam.version to v1.3.1 (#661)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [com.google.api.grpc:grpc-google-iam-v1](https://togithub.com/googleapis/java-iam) | `1.3.0` -> `1.3.1` | [![age](https://badges.renovateapi.com/packages/maven/com.google.api.grpc:grpc-google-iam-v1/1.3.1/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/maven/com.google.api.grpc:grpc-google-iam-v1/1.3.1/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/maven/com.google.api.grpc:grpc-google-iam-v1/1.3.1/compatibility-slim/1.3.0)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/com.google.api.grpc:grpc-google-iam-v1/1.3.1/confidence-slim/1.3.0)](https://docs.renovatebot.com/merge-confidence/) |
| [com.google.api.grpc:proto-google-iam-v1](https://togithub.com/googleapis/java-iam) | `1.3.0` -> `1.3.1` | [![age](https://badges.renovateapi.com/packages/maven/com.google.api.grpc:proto-google-iam-v1/1.3.1/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/maven/com.google.api.grpc:proto-google-iam-v1/1.3.1/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/maven/com.google.api.grpc:proto-google-iam-v1/1.3.1/compatibility-slim/1.3.0)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/com.google.api.grpc:proto-google-iam-v1/1.3.1/confidence-slim/1.3.0)](https://docs.renovatebot.com/merge-confidence/) |

---

### Release Notes

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

### [`v1.3.1`](https://togithub.com/googleapis/java-iam/blob/HEAD/CHANGELOG.md#&#8203;131-httpsgithubcomgoogleapisjava-iamcomparev130v131-2022-04-11)

[Compare Source](https://togithub.com/googleapis/java-iam/compare/v1.3.0...v1.3.1)

</details>

---

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java-shared-dependencies/first-party-dependencies/pom.xml

@@ -67,7 +67,7 @@
     <google.http-client.version>1.41.7</google.http-client.version>
     <google.oauth-client.version>1.33.2</google.oauth-client.version>
     <google.api-client.version>1.33.4</google.api-client.version>
-    <iam.version>1.3.0</iam.version>
+    <iam.version>1.3.1</iam.version>
   </properties>
 
   <dependencyManagement>