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Bump spring-core from 5.2.6.RELEASE to 5.3.14 in /parent

Bumps [spring-core](https://github.com/spring-projects/spring-framework) from 5.2.6.RELEASE to 5.3.14.
- [Release notes](https://github.com/spring-projects/spring-framework/releases)
- [Commits](https://github.com/spring-projects/spring-framework/compare/v5.2.6.RELEASE...v5.3.14)

---
updated-dependencies:
- dependency-name: org.springframework:spring-core
  dependency-type: direct:production
...

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