Bump ch.qos.logback:logback-core in /log4j-api-to-slf4j (#5)

Bumps [ch.qos.logback:logback-core](https://github.com/qos-ch/logback) from 1.5.12 to 1.5.13.
- [Commits](https://github.com/qos-ch/logback/compare/v_1.5.12...v_1.5.13)

---
updated-dependencies:
- dependency-name: ch.qos.logback:logback-core
  dependency-type: direct:production
...

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