Build: Bump fastavro from 1.12.0 to 1.12.1

Bumps [fastavro](https://github.com/fastavro/fastavro) from 1.12.0 to 1.12.1.
- [Release notes](https://github.com/fastavro/fastavro/releases)
- [Changelog](https://github.com/fastavro/fastavro/blob/master/ChangeLog)
- [Commits](fastavro/fastavro@1.12.0...1.12.1)

---
updated-dependencies:
- dependency-name: fastavro
  dependency-version: 1.12.1
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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Author: dependabot[bot]