deps: update dependency com.google.cloud:google-cloud-policy-troubleshooter-bom to v1.2.0 (#4622)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [com.google.cloud:google-cloud-policy-troubleshooter-bom](https://togithub.com/googleapis/java-policy-troubleshooter) | `1.1.1` -> `1.2.0` | [![age](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-policy-troubleshooter-bom/1.2.0/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-policy-troubleshooter-bom/1.2.0/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-policy-troubleshooter-bom/1.2.0/compatibility-slim/1.1.1)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-policy-troubleshooter-bom/1.2.0/confidence-slim/1.1.1)](https://docs.renovatebot.com/merge-confidence/) |

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### Release Notes

<details>
<summary>googleapis/java-policy-troubleshooter</summary>

### [`v1.2.0`](https://togithub.com/googleapis/java-policy-troubleshooter/blob/HEAD/CHANGELOG.md#&#8203;120-httpsgithubcomgoogleapisjava-policy-troubleshootercomparev111v120-2022-07-01)

[Compare Source](https://togithub.com/googleapis/java-policy-troubleshooter/compare/v1.1.1...v1.2.0)

##### Features

-   Enable REST transport for most of Java and Go clients ([#&#8203;229](https://togithub.com/googleapis/java-policy-troubleshooter/issues/229)) ([f1bd6b4](https://togithub.com/googleapis/java-policy-troubleshooter/commit/f1bd6b41e0dfa4d224a5c92f95d3b96075d80d41))

</details>

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Author: renovate-bot

google-cloud-bom/pom.xml

@@ -632,7 +632,7 @@
       <dependency>
         <groupId>com.google.cloud</groupId>
         <artifactId>google-cloud-policy-troubleshooter-bom</artifactId>
-        <version>1.1.1</version>
+        <version>1.2.0</version>
         <type>pom</type>
         <scope>import</scope>
       </dependency>