Fix deprecation warning in Knative Verify

[nak3]

As per title, this patch fixes the deprecation warning.

As following docs mentions, this patch just changes:

• python/name:materialx.emoji.twemoji to material.extensions.emoji.twemoji.
• python/name:materialx.emoji.to_svg to python/name:material.extensions.emoji.to_svg.

https://pypi.org/project/mkdocs-material-extensions/

NOTE: This project is now deprecated as MkDocs for Material now implements this logic directly. Users should migrate to using mkdocs-material's material.extensions.emoji.twemoji and material.extensions.emoji.to_svg in place of the respective materialx.emoji.twemoji and materialx.emoji.to_svg functions provided by this library.

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[knative-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: nak3

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[nak3]

/cc @Cali0707 @mmejia02 @vinfinity7

[knative-prow]

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[pmbanugo]

/lgtm

[pmbanugo]

@nak3 This is already merged but i think it broke the rendering of the home page

[nak3]

Ugh... Thank you. I will revert this.