Bump spring.version from 3.2.0.RELEASE to 5.2.6.RELEASE
Bump spring.version from 3.2.0.RELEASE to 5.2.6.RELEASE

Bumps `spring.version` from 3.2.0.RELEASE to 5.2.6.RELEASE.

Updates `spring-core` from 3.2.0.RELEASE to 5.2.6.RELEASE
- [Release notes](https://github.com/spring-projects/spring-framework/releases)
- [Commits](https://github.com/spring-projects/spring-framework/compare/v3.2.0.RELEASE...v5.2.6.RELEASE)

Updates `spring-web` from 3.2.0.RELEASE to 5.2.6.RELEASE
- [Release notes](https://github.com/spring-projects/spring-framework/releases)
- [Commits](https://github.com/spring-projects/spring-framework/compare/v3.2.0.RELEASE...v5.2.6.RELEASE)

Updates `spring-webmvc` from 3.2.0.RELEASE to 5.2.6.RELEASE
- [Release notes](https://github.com/spring-projects/spring-framework/releases)
- [Commits](https://github.com/spring-projects/spring-framework/compare/v3.2.0.RELEASE...v5.2.6.RELEASE)

Updates `spring-test` from 3.2.0.RELEASE to 5.2.6.RELEASE
- [Release notes](https://github.com/spring-projects/spring-framework/releases)
- [Commits](https://github.com/spring-projects/spring-framework/compare/v3.2.0.RELEASE...v5.2.6.RELEASE)

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@github.com>
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