Bump spring-boot-starter-web from 2.1.6.RELEASE to 2.5.12 in /backend
Bump spring-boot-starter-web from 2.1.6.RELEASE to 2.5.12 in /backend

Bumps [spring-boot-starter-web](https://github.com/spring-projects/spring-boot) from 2.1.6.RELEASE to 2.5.12.
- [Release notes](https://github.com/spring-projects/spring-boot/releases)
- [Commits](https://github.com/spring-projects/spring-boot/compare/v2.1.6.RELEASE...v2.5.12)

---
updated-dependencies:
- dependency-name: org.springframework.boot:spring-boot-starter-web
  dependency-type: direct:production
...

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