build(deps): bump zsa_firmware from 1bd6b1b to 9ec74b5 (#125)

Bumps [zsa_firmware](https://github.com/zsa/qmk_firmware) from `1bd6b1b` to `9ec74b5`.
- [Release notes](https://github.com/zsa/qmk_firmware/releases)
- [Commits](zsa/qmk_firmware@1bd6b1b...9ec74b5)

---
updated-dependencies:
- dependency-name: zsa_firmware
  dependency-type: direct:production
...

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