deps: update iam.version to v1.6.4 (#862)

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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://github.com/googleapis/java-iam/grpc-google-iam-v1) ([source](https://github.com/googleapis/java-iam)) | `1.6.3` -> `1.6.4` | [![age](https://badges.renovateapi.com/packages/maven/com.google.api.grpc:grpc-google-iam-v1/1.6.4/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/maven/com.google.api.grpc:grpc-google-iam-v1/1.6.4/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/maven/com.google.api.grpc:grpc-google-iam-v1/1.6.4/compatibility-slim/1.6.3)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/com.google.api.grpc:grpc-google-iam-v1/1.6.4/confidence-slim/1.6.3)](https://docs.renovatebot.com/merge-confidence/) |
| [com.google.api.grpc:proto-google-iam-v1](https://github.com/googleapis/java-iam/proto-google-iam-v1) ([source](https://github.com/googleapis/java-iam)) | `1.6.3` -> `1.6.4` | [![age](https://badges.renovateapi.com/packages/maven/com.google.api.grpc:proto-google-iam-v1/1.6.4/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/maven/com.google.api.grpc:proto-google-iam-v1/1.6.4/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/maven/com.google.api.grpc:proto-google-iam-v1/1.6.4/compatibility-slim/1.6.3)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/com.google.api.grpc:proto-google-iam-v1/1.6.4/confidence-slim/1.6.3)](https://docs.renovatebot.com/merge-confidence/) |

---

### Release Notes

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

### [`v1.6.4`](https://github.com/googleapis/java-iam/blob/HEAD/CHANGELOG.md#&#8203;164-httpsgithubcomgoogleapisjava-iamcomparev163v164-2022-10-10)

[Compare Source](https://github.com/googleapis/java-iam/compare/v1.6.3...v1.6.4)

##### Dependencies

-   Update dependency com.google.cloud:google-iam-policy to v1.6.3 ([#&#8203;472](https://github.com/googleapis/java-iam/issues/472)) ([8f911be](https://github.com/googleapis/java-iam/commit/8f911bef57b66ab9dd092ed7912702c038e8565e))

</details>

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

@@ -68,7 +68,7 @@
     <google.http-client.version>1.42.2</google.http-client.version>
     <google.oauth-client.version>1.34.1</google.oauth-client.version>
     <google.api-client.version>2.0.0</google.api-client.version>
-    <iam.version>1.6.3</iam.version>
+    <iam.version>1.6.4</iam.version>
   </properties>
 
   <dependencyManagement>