Build: Bump fastavro from 1.9.3 to 1.9.4 (#427)

Bumps [fastavro](https://github.com/fastavro/fastavro) from 1.9.3 to 1.9.4.
- [Release notes](https://github.com/fastavro/fastavro/releases)
- [Changelog](https://github.com/fastavro/fastavro/blob/master/ChangeLog)
- [Commits](fastavro/fastavro@1.9.3...1.9.4)

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

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

poetry.lock

@@ -77,7 +77,7 @@ pytest = "7.4.4"
 pytest-checkdocs = "2.10.1"
 pytest-lazy-fixture = "0.6.3"
 pre-commit = "3.5.0"
-fastavro = "1.9.3"
+fastavro = "1.9.4"
 coverage = { version = "^7.4.1", extras = ["toml"] }
 requests-mock = "1.11.0"
 moto = { version = "^5.0.1", extras = ["server"] }