deps: update dependency com.google.cloud:google-cloud-pubsub-bom to v…

…1.120.20 (#5404)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [com.google.cloud:google-cloud-pubsub-bom](https://togithub.com/googleapis/java-pubsub) | `1.120.19` -> `1.120.20` | [![age](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-pubsub-bom/1.120.20/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-pubsub-bom/1.120.20/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-pubsub-bom/1.120.20/compatibility-slim/1.120.19)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-pubsub-bom/1.120.20/confidence-slim/1.120.19)](https://docs.renovatebot.com/merge-confidence/) |

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### Release Notes

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

### [`v1.120.20`](https://togithub.com/googleapis/java-pubsub/blob/HEAD/CHANGELOG.md#&#8203;112020-httpsgithubcomgoogleapisjava-pubsubcomparev112019v112020-2022-10-05)

[Compare Source](https://togithub.com/googleapis/java-pubsub/compare/v1.120.19...v1.120.20)

##### Bug Fixes

-   update protobuf to v3.21.7 ([7c3ea60](https://togithub.com/googleapis/java-pubsub/commit/7c3ea6016e4288beab722a0c53c5ea132794e2bd))

</details>

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google-cloud-bom/pom.xml

@@ -646,7 +646,7 @@
       <dependency>
         <groupId>com.google.cloud</groupId>
         <artifactId>google-cloud-pubsub-bom</artifactId>
-        <version>1.120.19</version>
+        <version>1.120.20</version>
         <type>pom</type>
         <scope>import</scope>
       </dependency>