deps: update dependency com.google.cloud:google-cloud-iamcredentials-bom to v2.3.0 (#4658)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [com.google.cloud:google-cloud-iamcredentials-bom](https://togithub.com/googleapis/java-iamcredentials) | `2.2.0` -> `2.3.0` | [![age](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-iamcredentials-bom/2.3.0/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-iamcredentials-bom/2.3.0/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-iamcredentials-bom/2.3.0/compatibility-slim/2.2.0)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-iamcredentials-bom/2.3.0/confidence-slim/2.2.0)](https://docs.renovatebot.com/merge-confidence/) |

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### Release Notes

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

### [`v2.3.0`](https://togithub.com/googleapis/java-iamcredentials/blob/HEAD/CHANGELOG.md#&#8203;230-httpsgithubcomgoogleapisjava-iamcredentialscomparev220v230-2022-07-01)

[Compare Source](https://togithub.com/googleapis/java-iamcredentials/compare/v2.2.0...v2.3.0)

##### Features

-   Enable REST transport for most of Java and Go clients ([#&#8203;693](https://togithub.com/googleapis/java-iamcredentials/issues/693)) ([f31eb47](https://togithub.com/googleapis/java-iamcredentials/commit/f31eb4737b1cb5420a7619d8ee3efb01d0444e12))

##### Dependencies

-   update dependency com.google.cloud:google-cloud-shared-dependencies to v2.13.0 ([#&#8203;692](https://togithub.com/googleapis/java-iamcredentials/issues/692)) ([48f6dbb](https://togithub.com/googleapis/java-iamcredentials/commit/48f6dbb4786d6199952d6a885da9bc9a4d7e832d))

</details>

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Author: renovate-bot

google-cloud-bom/pom.xml

@@ -484,7 +484,7 @@
       <dependency>
         <groupId>com.google.cloud</groupId>
         <artifactId>google-cloud-iamcredentials-bom</artifactId>
-        <version>2.2.0</version>
+        <version>2.3.0</version>
         <type>pom</type>
         <scope>import</scope>
       </dependency>