Bump spring.version in /examples/12-VideoSvcAppEngineJDO
Bump spring.version in /examples/12-VideoSvcAppEngineJDO

Bumps `spring.version` from 4.0.0.RELEASE to 5.3.1.

Updates `spring-aop` from 4.0.0.RELEASE to 5.3.1
- [Release notes](https://github.com/spring-projects/spring-framework/releases)
- [Commits](https://github.com/spring-projects/spring-framework/compare/v4.0.0.RELEASE...v5.3.1)

Updates `spring-context` from 4.0.0.RELEASE to 5.3.1
- [Release notes](https://github.com/spring-projects/spring-framework/releases)
- [Commits](https://github.com/spring-projects/spring-framework/compare/v4.0.0.RELEASE...v5.3.1)

Updates `spring-beans` from 4.0.0.RELEASE to 5.3.1
- [Release notes](https://github.com/spring-projects/spring-framework/releases)
- [Commits](https://github.com/spring-projects/spring-framework/compare/v4.0.0.RELEASE...v5.3.1)

Updates `spring-context-support` from 4.0.0.RELEASE to 5.3.1
- [Release notes](https://github.com/spring-projects/spring-framework/releases)
- [Commits](https://github.com/spring-projects/spring-framework/compare/v4.0.0.RELEASE...v5.3.1)

Updates `spring-core` from 4.0.0.RELEASE to 5.3.1
- [Release notes](https://github.com/spring-projects/spring-framework/releases)
- [Commits](https://github.com/spring-projects/spring-framework/compare/v4.0.0.RELEASE...v5.3.1)

Updates `spring-expression` from 4.0.0.RELEASE to 5.3.1
- [Release notes](https://github.com/spring-projects/spring-framework/releases)
- [Commits](https://github.com/spring-projects/spring-framework/compare/v4.0.0.RELEASE...v5.3.1)

Updates `spring-web` from 4.0.0.RELEASE to 5.3.1
- [Release notes](https://github.com/spring-projects/spring-framework/releases)
- [Commits](https://github.com/spring-projects/spring-framework/compare/v4.0.0.RELEASE...v5.3.1)

Updates `spring-webmvc` from 4.0.0.RELEASE to 5.3.1
- [Release notes](https://github.com/spring-projects/spring-framework/releases)
- [Commits](https://github.com/spring-projects/spring-framework/compare/v4.0.0.RELEASE...v5.3.1)

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@github.com>
CourseraK2/mobilecloud-15,CourseraK2/mobilecloud-15