Changing WordPress widget title heading tag using jQuery

On a site that I worked on today it was required to change the widget title HTML output from

<h4 class="widget-title widgettitle">Meta</h4>

to

<h2 class="widget-title widgettitle"><span>Meta</span></h2>

for a specific widget for styling it uniquely.

i.e., before:

after:

While it is possible to customize title markup for all widgets in Genesis using genesis_register_sidebar_defaults filter, I do not think it can be applied to just a specific widget.

Therefore I used the following simple code.