I think it's quite a bit out of date generally
<meta name="generator" content="MediaWiki 1.27.0-wmf.21"/>
https://github.com/wikimedia/service-template-node/blob/master/static/index.html#L347C1-L347C508
<td style="text-align:center; padding:4px;"><a href="//www.mediawiki.org/wiki/" title="MediaWiki"><img alt="MediaWiki" src="//upload.wikimedia.org/wikipedia/commons/thumb/3/3d/Mediawiki-logo.png/35px-Mediawiki-logo.png" width="35" height="26" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/3/3d/Mediawiki-logo.png/53px-Mediawiki-logo.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/3/3d/Mediawiki-logo.png/70px-Mediawiki-logo.png 2x" data-file-width="135" data-file-height="102" /></a></td>
This is using https://commons.wikimedia.org/wiki/File:Mediawiki-logo.png which is the old logo.
It should use something from https://commons.wikimedia.org/wiki/Category:MediaWiki_logo_(2020), and most likely https://commons.wikimedia.org/wiki/File:MediaWiki-2020-icon.svg which is what is used on wikipedia pages currently.
Seems similar to {05bf8f468748e6a0d854d315effabf87605f40f4} for T107430
<img alt="MediaWiki logo" resource="./File:MediaWiki-2020-icon.svg" src="//upload.wikimedia.org/wikipedia/commons/thumb/a/a6/MediaWiki-2020-icon.svg/35px-MediaWiki-2020-icon.svg.png" decoding="async" data-file-width="100" data-file-height="100" data-file-type="drawing" height="35" width="35" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/a/a6/MediaWiki-2020-icon.svg/53px-MediaWiki-2020-icon.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/a/a6/MediaWiki-2020-icon.svg/70px-MediaWiki-2020-icon.svg.png 2x" class="mw-file-element">
xref: T357917: Wikifeeds static/index.html uses old MediaWiki logo, T357918: recommendation-api static/index.html uses old MediaWiki logo