deps: update dependency com.google.cloud:google-cloud-pubsub-bom to v1.120.16 (#670)

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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) | `1.120.14` -> `1.120.16` | [![age](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-pubsub-bom/1.120.16/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-pubsub-bom/1.120.16/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-pubsub-bom/1.120.16/compatibility-slim/1.120.14)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-pubsub-bom/1.120.16/confidence-slim/1.120.14)](https://docs.renovatebot.com/merge-confidence/) |

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### Release Notes

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

### [`v1.120.16`](https://togithub.com/googleapis/java-pubsub/blob/HEAD/CHANGELOG.md#&#8203;112016-httpsgithubcomgoogleapisjava-pubsubcomparev112015v112016-2022-09-15)

[Compare Source](https://togithub.com/googleapis/java-pubsub/compare/v1.120.15...v1.120.16)

##### Dependencies

-   Update dependency com.google.cloud:google-cloud-shared-dependencies to v3.0.3 ([#&#8203;1279](https://togithub.com/googleapis/java-pubsub/issues/1279)) ([654ea40](https://togithub.com/googleapis/java-pubsub/commit/654ea400f5df0b2544f4b668e1f5ee72f3ea54d2))

### [`v1.120.15`](https://togithub.com/googleapis/java-pubsub/blob/HEAD/CHANGELOG.md#&#8203;112015-httpsgithubcomgoogleapisjava-pubsubcomparev112014v112015-2022-09-13)

[Compare Source](https://togithub.com/googleapis/java-pubsub/compare/v1.120.14...v1.120.15)

##### Dependencies

-   Update dependency com.google.cloud:google-cloud-bigquery to v2.16.0 ([#&#8203;1271](https://togithub.com/googleapis/java-pubsub/issues/1271)) ([439215a](https://togithub.com/googleapis/java-pubsub/commit/439215aaee1572859d323139c7a86e086a331486))

</details>

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Author: renovate-bot

pom.xml

@@ -61,7 +61,7 @@
       <dependency>
         <groupId>com.google.cloud</groupId>
         <artifactId>google-cloud-pubsub-bom</artifactId>
-        <version>1.120.14</version>
+        <version>1.120.16</version>
         <type>pom</type>
         <scope>import</scope>
       </dependency>