build(deps-dev): bump spring-context from 5.2.14.RELEASE to 5.3.21

Bumps [spring-context](https://github.com/spring-projects/spring-framework) from 5.2.14.RELEASE to 5.3.21.
- [Release notes](https://github.com/spring-projects/spring-framework/releases)
- [Commits](spring-projects/spring-framework@v5.2.14.RELEASE...v5.3.21)

---
updated-dependencies:
- dependency-name: org.springframework:spring-context
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

core/pom.xml

@@ -47,7 +47,7 @@
     <dependency>
       <groupId>org.springframework</groupId>
       <artifactId>spring-context</artifactId>
-      <version>5.2.14.RELEASE</version>
+      <version>5.3.21</version>
       <scope>test</scope>
     </dependency>