[wp-trac] [WordPress Trac] #53502: Twenty Twenty-One: Remove use of `filemtime()`

[WordPress Trac]

#53502: Twenty Twenty-One: Remove use of `filemtime()`
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 Reporter:  desrosj                   |       Owner:  (none)
     Type:  defect (bug)              |      Status:  new
 Priority:  normal                    |   Milestone:  5.8.1
Component:  Bundled Theme             |     Version:  5.6
 Severity:  normal                    |  Resolution:
 Keywords:  good-first-bug has-patch  |     Focuses:
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Comment (by aristath):

 Makes sense to change it to use the theme-version.

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Ticket URL: <https://core.trac.wordpress.org/ticket/53502#comment:9>
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