fix(deps): bump blaxel from 0.2.50 to 0.4.20

Bumps [blaxel](https://github.com/blaxel-ai/sdk-python) from 0.2.50 to 0.4.20.
- [Release notes](https://github.com/blaxel-ai/sdk-python/releases)
- [Commits](blaxel-ai/sdk-python@v0.2.50...v0.4.20)

---
updated-dependencies:
- dependency-name: blaxel
  dependency-version: 0.4.20
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]