bump version to 2.21.1 and update dependencies

- Updated `form-data` from `^4.0.0` to `^4.0.4`
- Added `semver` as a new dependency `^5.7.2` (transitive dep)
- Updated `babel-eslint` from `^8.2.1` to `^10.1.0`
- Updated `mocha` from `^9.1.3` to `^10.0.0`
- Updated `nyc` from `^15.1.0` to `^17.1.0`
- Added new dependencies: `braces` `^3.0.3` and `json5` `^1.0.2` (transitive deps)

Author: PavelLoparev