Bump com.google.guava:guava-testlib from 33.3.1-jre to 33.4.0-jre

Bumps [com.google.guava:guava-testlib](https://github.com/google/guava) from 33.3.1-jre to 33.4.0-jre.
- [Release notes](https://github.com/google/guava/releases)
- [Commits](https://github.com/google/guava/commits)

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

Signed-off-by: dependabot[bot] <[email protected]>

org.eclipse.xtext.dev-bom/pom.xml

@@ -163,7 +163,7 @@
 			<dependency>
 				<groupId>com.google.guava</groupId>
 				<artifactId>guava-testlib</artifactId>
-				<version>33.3.1-jre</version>
+				<version>33.4.0-jre</version>
 			</dependency>
 			<dependency>
 				<groupId>com.google.guava</groupId>