deps: update dependency com.google.cloud:google-cloud-functions-bom to v2.4.2 (#4598)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [com.google.cloud:google-cloud-functions-bom](https://togithub.com/googleapis/java-functions) | `2.4.1` -> `2.4.2` | [![age](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-functions-bom/2.4.2/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-functions-bom/2.4.2/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-functions-bom/2.4.2/compatibility-slim/2.4.1)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-functions-bom/2.4.2/confidence-slim/2.4.1)](https://docs.renovatebot.com/merge-confidence/) |

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### Release Notes

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

### [`v2.4.2`](https://togithub.com/googleapis/java-functions/blob/HEAD/CHANGELOG.md#&#8203;242-httpsgithubcomgoogleapisjava-functionscomparev241v242-2022-07-01)

[Compare Source](https://togithub.com/googleapis/java-functions/compare/v2.4.1...v2.4.2)

##### Bug Fixes

-   update gapic-generator-java with mock service generation fixes ([#&#8203;424](https://togithub.com/googleapis/java-functions/issues/424)) ([721c8dc](https://togithub.com/googleapis/java-functions/commit/721c8dcc1f75feee52a82be47b292bb7d9dad887))

</details>

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Author: renovate-bot

google-cloud-bom/pom.xml

@@ -455,7 +455,7 @@
       <dependency>
         <groupId>com.google.cloud</groupId>
         <artifactId>google-cloud-functions-bom</artifactId>
-        <version>2.4.1</version>
+        <version>2.4.2</version>
         <type>pom</type>
         <scope>import</scope>
       </dependency>