Bump spring-core from 2.0.8 to 4.3.19.RELEASE
Bump spring-core from 2.0.8 to 4.3.19.RELEASE

Bumps [spring-core](https://github.com/spring-projects/spring-framework) from 2.0.8 to 4.3.19.RELEASE.
- [Release notes](https://github.com/spring-projects/spring-framework/releases)
- [Commits](https://github.com/spring-projects/spring-framework/commits/v4.3.19.RELEASE)

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@github.com>
googleinterns/step259-2020,googleinterns/step259-2020,googleinterns/step259-2020