build(deps): bump com.google.cloud:spring-cloud-gcp-dependencies (#2626)

Bumps [com.google.cloud:spring-cloud-gcp-dependencies](https://github.com/GoogleCloudPlatform/spring-cloud-gcp) from 7.3.2 to 7.4.0.
- [Release notes](https://github.com/GoogleCloudPlatform/spring-cloud-gcp/releases)
- [Changelog](https://github.com/GoogleCloudPlatform/spring-cloud-gcp/blob/main/CHANGELOG.md)
- [Commits](GoogleCloudPlatform/spring-cloud-gcp@v7.3.2...v7.4.0)

---
updated-dependencies:
- dependency-name: com.google.cloud:spring-cloud-gcp-dependencies
  dependency-version: 7.4.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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testcontainers-spring-boot-parent/pom.xml

@@ -17,7 +17,7 @@
     <properties>
         <spring.boot.version>3.5.6</spring.boot.version>
         <spring.cloud.version>2025.0.0</spring.cloud.version>
-        <spring.cloud.gcp.version>7.3.2</spring.cloud.gcp.version>
+        <spring.cloud.gcp.version>7.4.0</spring.cloud.gcp.version>
         <equalsverifier.version>4.2</equalsverifier.version>
         <junit-jupiter.version>6.0.0</junit-jupiter.version>
         <spring.cloud.azure.version>6.0.0</spring.cloud.azure.version>