deps: update dependency com.google.cloud:google-cloud-build-bom to v2.4.0 (#1919)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [com.google.cloud:google-cloud-build-bom](https://github.com/googleapis/java-cloudbuild) | `2.3.1` -> `2.4.0` | [![age](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-build-bom/2.4.0/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-build-bom/2.4.0/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-build-bom/2.4.0/compatibility-slim/2.3.1)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-build-bom/2.4.0/confidence-slim/2.3.1)](https://docs.renovatebot.com/merge-confidence/) |

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### Release Notes

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

### [`v2.4.0`](https://github.com/googleapis/java-cloudbuild/blob/master/CHANGELOG.md#&#8203;240-httpswwwgithubcomgoogleapisjava-cloudbuildcomparev231v240-2021-04-23)

[Compare Source](https://github.com/googleapis/java-cloudbuild/compare/v2.3.1...v2.4.0)

##### Features

-   Add fields for Pub/Sub triggers ([#&#8203;457](https://github.com/googleapis/java-cloudbuild/issues/457)) ([55b10de](https://github.com/googleapis/java-cloudbuild/commit/55b10de722d09d8a861fc1325eeda14a208add15))

##### Bug Fixes

-   release scripts from issuing overlapping phases ([#&#8203;456](https://github.com/googleapis/java-cloudbuild/issues/456)) ([ad05975](https://github.com/googleapis/java-cloudbuild/commit/ad0597543005b36650c577490f8a93a5511fa1c2))
-   typo ([#&#8203;453](https://github.com/googleapis/java-cloudbuild/issues/453)) ([dffb9db](https://github.com/googleapis/java-cloudbuild/commit/dffb9db12cc0f557031e1509c5ff13239443e6ba))

##### Dependencies

-   update dependency com.google.cloud:google-cloud-shared-dependencies to v0.21.1 ([#&#8203;460](https://github.com/googleapis/java-cloudbuild/issues/460)) ([d34cd4d](https://github.com/googleapis/java-cloudbuild/commit/d34cd4d347e637c847900ada7aca788608c69fb8))
-   update dependency com.google.cloud:google-cloud-shared-dependencies to v1 ([#&#8203;463](https://github.com/googleapis/java-cloudbuild/issues/463)) ([82711b3](https://github.com/googleapis/java-cloudbuild/commit/82711b36eeeebf187566586e9e2d6441e074562b))

##### [2.3.1](https://github.com/googleapis/java-cloudbuild/compare/v2.3.0...v2.3.1) (2021-04-09)

##### Dependencies

-   update dependency com.google.cloud:google-cloud-shared-dependencies to v0.21.0 ([#&#8203;443](https://github.com/googleapis/java-cloudbuild/issues/443)) ([c35948a](https://github.com/googleapis/java-cloudbuild/commit/c35948a9ff3e4f901d02711d222e69dc57848b7d))

</details>

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Author: renovate-bot

pom.xml

@@ -238,7 +238,7 @@
       <dependency>
         <groupId>com.google.cloud</groupId>
         <artifactId>google-cloud-build-bom</artifactId>
-        <version>2.3.1</version>
+        <version>2.4.0</version>
         <type>pom</type>
         <scope>import</scope>
       </dependency>