build(deps): bump zsa_firmware from 47c470e to 1a7e7e0

Bumps [zsa_firmware](https://github.com/zsa/qmk_firmware) from `47c470e` to `1a7e7e0`.
- [Release notes](https://github.com/zsa/qmk_firmware/releases)
- [Commits](zsa/qmk_firmware@47c470e...1a7e7e0)

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

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