Bump bentoml from 1.2.5 to 1.4.8 (#741)

Bumps [bentoml](https://github.com/bentoml/bentoml) from 1.2.5 to 1.4.8.
- [Release notes](https://github.com/bentoml/bentoml/releases)
- [Commits](bentoml/BentoML@v1.2.5...v1.4.8)

---
updated-dependencies:
- dependency-name: bentoml
  dependency-version: 1.4.8
  dependency-type: direct:development
...

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