deps: bump com.google.truth:truth from 1.3.0 to 1.4.0 (#2578)

Bumps [com.google.truth:truth](https://github.com/google/truth) from 1.3.0 to 1.4.0.
- [Release notes](https://github.com/google/truth/releases)
- [Commits](google/truth@v1.3.0...v1.4.0)

---
updated-dependencies:
- dependency-name: com.google.truth:truth
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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spring-cloud-generator/pom.xml

@@ -61,7 +61,7 @@
         <dependency>
             <groupId>com.google.truth</groupId>
             <artifactId>truth</artifactId>
-            <version>1.3.0</version>
+            <version>1.4.0</version>
             <scope>test</scope>
         </dependency>
     </dependencies>