chore(deps): Bump ch.qos.logback:logback-core from 1.3.14 to 1.3.15 (#63)

Bumps [ch.qos.logback:logback-core](https://github.com/qos-ch/logback) from 1.3.14 to 1.3.15.
- [Release notes](https://github.com/qos-ch/logback/releases)
- [Commits](https://github.com/qos-ch/logback/compare/v_1.3.14...v_1.3.15)

---
updated-dependencies:
- dependency-name: ch.qos.logback:logback-core
  dependency-version: 1.3.15
  dependency-type: direct:production
...

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