Bump spring-test from 5.3.20 to 5.3.21

Bumps [spring-test](https://github.com/spring-projects/spring-framework) from 5.3.20 to 5.3.21.
- [Release notes](https://github.com/spring-projects/spring-framework/releases)
- [Commits](spring-projects/spring-framework@v5.3.20...v5.3.21)

---
updated-dependencies:
- dependency-name: org.springframework:spring-test
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

pom.xml

@@ -61,7 +61,7 @@
     <apache.commons.io>2.11.0</apache.commons.io>
     <common.codec.version>1.15</common.codec.version>
     <spring.boot.version>2.7.0</spring.boot.version>
-    <spring.version>5.3.20</spring.version>
+    <spring.version>5.3.21</spring.version>
     <prometheus.client.version>0.15.0</prometheus.client.version>
 
     <e2e.skip>true</e2e.skip>