Update dependency katex to v0.16.20

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
katex (source)	0.16.2 -> 0.16.20

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Release Notes

KaTeX/KaTeX (katex)

v0.16.20

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Bug Fixes

• \providecommand does not overwrite existing macro (#​4000) (6d30fe4), closes #​3928

v0.16.19

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Bug Fixes

• types: improve strict function type (#​4009) (4228b4e)

v0.16.18

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Bug Fixes

• Actually publish TypeScript type definitions (#​4008) (629b873)

v0.16.17

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Bug Fixes

• MathML combines multidigit numbers with sup/subscript, comma separators, and multicharacter text when outputting to DOM (#​3999) (7d79e22), closes #​3995

v0.16.16

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Features

• ESM exports, TypeScript types (#​3992) (ea9c173)

v0.16.15

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Features

• italic sans-serif in math mode via \mathsfit command (#​3998) (2218901)

v0.16.14

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Features

• \dddot and \ddddot support (#​3834) (bda35cd), closes #​2744

v0.16.13

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Bug Fixes

• \vdots and \rule support in text mode (#​3997) (0e08352), closes #​3990

v0.16.12

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Features

• css: configurable margin for display math (#​3638) (3405001)

v0.16.11

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Features

• add \emph (#​3963) (9f34da4), closes #​3566

v0.16.10

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Bug Fixes

• \edef bypassing maxExpand via exponential blowup (e88b4c3)
• escape \includegraphics src and alt (c5897fc)
• force protocol to be lowercase for better protocol filtering (fc5af64), closes /datatracker.ietf.org/doc/html/rfc3986#section-3
• maxExpand limit with Unicode sub/superscripts (085e21b)

v0.16.9

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Features

• Support bold Fraktur (#​3777) (240d5ae)

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

v0.16.4

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Bug Fixes

• space should prevent optional argument to \ (#​3746) (a0deb34), closes #​3745

v0.16.3

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Bug Fixes

• \hline after \cr (#​3735) (ebf6bf5), closes #​3734

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