deps: update dependency com.google.cloud:google-cloud-iamcredentials-bom to v1.1.2 (#942)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [com.google.cloud:google-cloud-iamcredentials-bom](https://github.com/googleapis/java-iamcredentials) | patch | `1.1.1` -> `1.1.2` |

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### Release Notes

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

### [`v1.1.2`](https://github.com/googleapis/java-iamcredentials/blob/master/CHANGELOG.md#&#8203;112-httpswwwgithubcomgoogleapisjava-iamcredentialscomparev111v112-2020-09-23)

[Compare Source](https://github.com/googleapis/java-iamcredentials/compare/v1.1.1...v1.1.2)

</details>

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Author: renovate-bot

pom.xml

@@ -366,7 +366,7 @@
       <dependency>
         <groupId>com.google.cloud</groupId>
         <artifactId>google-cloud-iamcredentials-bom</artifactId>
-        <version>1.1.1</version>
+        <version>1.1.2</version>
         <type>pom</type>
         <scope>import</scope>
       </dependency>