Bump slf4j-ext from 1.7.28 to 1.7.29
Bump slf4j-ext from 1.7.28 to 1.7.29

Bumps [slf4j-ext](https://github.com/qos-ch/slf4j) from 1.7.28 to 1.7.29.
- [Release notes](https://github.com/qos-ch/slf4j/releases)
- [Commits](https://github.com/qos-ch/slf4j/commits)

Signed-off-by: dependabot-preview[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
zalando/problem-spring-web,zalando/problem-spring-web