Bump mathjs from 3.13.3 to 3.20.2
Bump mathjs from 3.13.3 to 3.20.2

Bumps [mathjs](https://github.com/josdejong/mathjs) from 3.13.3 to 3.20.2.
- [Release notes](https://github.com/josdejong/mathjs/releases)
- [Changelog](https://github.com/josdejong/mathjs/blob/develop/HISTORY.md)
- [Commits](https://github.com/josdejong/mathjs/compare/v3.13.3...v3.20.2)

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@github.com>
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