Bump spring-boot-starter-parent from 2.3.1.RELEASE to 2.3.4.RELEASE

Bumps [spring-boot-starter-parent](https://github.com/spring-projects/spring-boot) from 2.3.1.RELEASE to 2.3.4.RELEASE.
- [Release notes](https://github.com/spring-projects/spring-boot/releases)
- [Commits](spring-projects/spring-boot@v2.3.1.RELEASE...v2.3.4.RELEASE)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

pom.xml

@@ -54,7 +54,7 @@
 	<parent>
 		<groupId>org.springframework.boot</groupId>
 		<artifactId>spring-boot-starter-parent</artifactId>
-		<version>2.3.1.RELEASE</version>
+		<version>2.3.4.RELEASE</version>
 		<relativePath/> <!-- lookup parent from repository -->
 	</parent>