fix(deps): update dependency mathjs to v9

[renovate-bot]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
mathjs (source)	^8.0.0 -> ^9.0.0

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Release Notes

josdejong/mathjs

### [`v9.0.0`](https://togithub.com/josdejong/mathjs/blob/master/HISTORY.md#​2021-01-16-version-900) [Compare Source](https://togithub.com/josdejong/mathjs/compare/v8.1.1...v9.0.0) - Improved support for bin, hex, and oct literals. See [#​1996](https://togithub.com/josdejong/mathjs/issues/1996). Thanks [@​clnhlzmn](https://togithub.com/clnhlzmn). - **Breaking change**: parse literals with prefixes `0b`, `0c`, and `0x` are now unsigned by default. To parse them as signed, you have to specify a suffix specifying the word size such as `i16` or `i32`. - Function `format` now supports more notations: `bin`, 'hex', and `oct`, for example `format(255, {notation: "hex"})`. - The functions `format`, `bin`, `hex`, `oct` now allow specifying a wordSize, like `bin(10, 32)` and `format(10, {notation: "bin", wordSize: 32})`. - BigNumber support for the bin, hex, and oct literals. - Extended and improved the example rocket_trajectory_optimization.html. Thanks [@​Josef37](https://togithub.com/Josef37).

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[codecov[bot]]

Codecov Report

Merging #537 (856f570) into master (ccededc) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #537   +/-   ##
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  Coverage   95.47%   95.47%           
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  Files           7        7           
  Lines        1789     1789           
  Branches       90       92    +2     
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  Hits         1708     1708           
  Misses         79       79           
  Partials        2        2           

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