fix(deps): update dependency katex to v0.13.9

This MR contains the following updates:

Package	Type	Update	Change
katex (source)	dependencies	patch	0.13.8 -> 0.13.9

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Release Notes

KaTeX/KaTeX

v0.13.9

Compare Source

Bug Fixes

• MathML for stretchy accents. #​2990 (#​2991) (1cb6279)

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