Update dependency mathjs to v10.6.4

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
mathjs (source)	10.5.2 -> 10.6.4

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Release Notes

josdejong/mathjs (mathjs)

v10.6.4

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• Improve TypeScript definitions of the factory function, thanks @​mattvague.

v10.6.3

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• Revert the TypeScript definition fixes for factory applied in v10.6.2,
  they give some complications.

v10.6.2

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• Improve TypeScript definitions of ParenthesisNode. Thanks @​mattvague.
• Change the TypeScript definition of MathNodeCommon['type'] into a less
  strict string, so it is possible to extend with new Node classes.
  Thanks @​mattvague.
• Improve TypeScript definitions of the factory function, thanks @​mattvague.

v10.6.1

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• Improve the TypeScript types For OperatorNode: you can now define generic
  types like OperatorNode<'+', 'add'>. Thanks @​mattvague.

v10.6.0

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• Implementation of fourier transform functions fft and ifft (#​2540).
  Thanks @​HanchaiN.
• Fix TypeScript types not being listed in the exported fields (#​2569).
  Thanks @​mattvague.
• Large improvements in TypeScript definitions for chained expressions (#​2537).
  Thanks @​mattvague.
• Fix #​2571: improve TypeScript definition of functions clone and cloneDeep
  (#​2572). Thanks @​mattvague.
• Fix the first argument of derivative holding the expression not correctly
  being converted when using .toTex() (#​2564). Thanks @​mattvague.

v10.5.3

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• Fix #​2337: npm package containing examples and docs to solve security
  vulnerabilities being reported on the examples and their dependencies.
• Fix core, construction, and some other functions missing in docs.
• Drop official support for Node.js 12 which has reached its end of life.

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