fix(deps): update dependency katex to v0.13.8

This MR contains the following updates:

Package	Type	Update	Change
katex (source)	dependencies	patch	0.13.7 -> 0.13.8

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Release Notes

KaTeX/KaTeX

v0.13.8

Compare Source

Features

• \operatornamewithlimits (and clean up \operatorname support) (#​2984) (e9b751b)

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