Update dependency katex to v0.13.20

This MR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
katex (source)	0.13.18 -> 0.13.20

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Release Notes

KaTeX/KaTeX

v0.13.20

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Performance Improvements

• Avoid vertical-align:0em style (#​3358) (6d6d627), closes #​3351

v0.13.19

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Features

• cli: --trust flag for trusting cli input (#​3339) (503f7d7), closes #​2428

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