deps: update dependency com.google.cloud:google-cloud-pubsub to v1.120.18 (#995)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [com.google.cloud:google-cloud-pubsub](https://togithub.com/googleapis/java-pubsub) | `1.120.17` -> `1.120.18` | [![age](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-pubsub/1.120.18/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-pubsub/1.120.18/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-pubsub/1.120.18/compatibility-slim/1.120.17)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-pubsub/1.120.18/confidence-slim/1.120.17)](https://docs.renovatebot.com/merge-confidence/) |

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### Release Notes

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

### [`v1.120.18`](https://togithub.com/googleapis/java-pubsub/blob/HEAD/CHANGELOG.md#&#8203;112018-httpsgithubcomgoogleapisjava-pubsubcomparev112017v112018-2022-09-21)

[Compare Source](https://togithub.com/googleapis/java-pubsub/compare/v1.120.17...v1.120.18)

##### Dependencies

-   Update dependency com.google.cloud:google-cloud-core to v2.8.13 ([#&#8203;1288](https://togithub.com/googleapis/java-pubsub/issues/1288)) ([708a1df](https://togithub.com/googleapis/java-pubsub/commit/708a1df692b64d86915133ac4ae87e45f4d669d8))
-   Update dependency com.google.cloud:google-cloud-core to v2.8.14 ([#&#8203;1291](https://togithub.com/googleapis/java-pubsub/issues/1291)) ([1c479de](https://togithub.com/googleapis/java-pubsub/commit/1c479de525a28fc323697d9a4e92f6ee3215a18f))
-   Update dependency org.junit.vintage:junit-vintage-engine to v5.9.1 ([#&#8203;1289](https://togithub.com/googleapis/java-pubsub/issues/1289)) ([216ba7d](https://togithub.com/googleapis/java-pubsub/commit/216ba7db4f0fab29c4bf9fc785387b23f64beb5e))

</details>

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Author: renovate-bot

samples/install-without-bom/pom.xml

@@ -36,7 +36,7 @@
     <dependency>
       <groupId>com.google.cloud</groupId>
       <artifactId>google-cloud-pubsub</artifactId>
-      <version>1.120.17</version>
+      <version>1.120.18</version>
     </dependency>
     <dependency>
       <groupId>junit</groupId>

samples/snapshot/pom.xml

@@ -35,7 +35,7 @@
     <dependency>
       <groupId>com.google.cloud</groupId>
       <artifactId>google-cloud-pubsub</artifactId>
-      <version>1.120.17</version>
+      <version>1.120.18</version>
     </dependency>
     <dependency>
       <groupId>junit</groupId>