Bump spring-boot-starter-test from 2.4.1 to 2.4.3 (#74)

Bumps [spring-boot-starter-test](https://github.com/spring-projects/spring-boot) from 2.4.1 to 2.4.3.
- [Release notes](https://github.com/spring-projects/spring-boot/releases)
- [Commits](spring-projects/spring-boot@v2.4.1...v2.4.3)

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Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

Author: dependabot-preview[bot]

clusterj-app/pom.xml

@@ -31,7 +31,7 @@
         <dependency>
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-starter-test</artifactId>
-            <version>2.4.1</version>
+            <version>2.4.3</version>
             <scope>test</scope>
             <exclusions>
                 <exclusion>