Bump spring.version from 5.3.20 to 5.3.21

Bumps `spring.version` from 5.3.20 to 5.3.21.

Updates `spring-test` 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)

Updates `spring-context-support` 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)

Updates `spring-orm` 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:development
  update-type: version-update:semver-patch
- dependency-name: org.springframework:spring-context-support
  dependency-type: direct:development
  update-type: version-update:semver-patch
- dependency-name: org.springframework:spring-orm
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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

pom.xml

@@ -58,7 +58,7 @@
         <testcontainers.version>1.17.2</testcontainers.version>
         <jackson.version>2.13.3</jackson.version>
 
-        <spring.version>5.3.20</spring.version>
+        <spring.version>5.3.21</spring.version>
         <commons-io.version>2.11.0</commons-io.version>
         <javax.inject.version>1</javax.inject.version>
         <javax.jaxb-api.version>2.3.1</javax.jaxb-api.version>