Bump spring-test from 5.3.8 to 5.3.9

Bumps [spring-test](https://github.com/spring-projects/spring-framework) from 5.3.8 to 5.3.9.
- [Release notes](https://github.com/spring-projects/spring-framework/releases)
- [Commits](spring-projects/spring-framework@v5.3.8...v5.3.9)

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

Author: dependabot-preview[bot]

pom.xml

@@ -61,7 +61,7 @@
         <asciidoctor.maven.plugin.version>2.1.0</asciidoctor.maven.plugin.version>
         <asciidoctorj.diagram.version>2.1.2</asciidoctorj.diagram.version>
 
-        <spring.test.version>5.3.8</spring.test.version>
+        <spring.test.version>5.3.9</spring.test.version>
         <spring.boot.version>2.5.1</spring.boot.version>
         <spring.boot.starter.celesta.version>2.1.47</spring.boot.starter.celesta.version>
         <celesta.version>7.3.45</celesta.version>