fix(deps): update dependency katex to v0.16.8

This MR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
katex (source)	0.16.4 -> 0.16.8
@types/katex (source)	0.16.0 -> 0.16.3

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Release Notes

KaTeX/KaTeX

v0.16.8

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Features

• expose error length and raw error message on ParseError (#​3820) (710774a)

v0.16.7

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Bug Fixes

• docs/support_table.md: delete redundant "varPsi" (#​3814) (33a1b98)

v0.16.6

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Bug Fixes

• Support \let via macros option (#​3738) (bdb0be2), closes #​3737 #​3737

v0.16.5

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Features

• __defineFunction API exposing internal defineFunction (#​3805) (c7b1f84), closes #​3756

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