Previously, bulk upgrades did not verify that a theme package was compatible with the site's WordPress version or the server's PHP version.
This was previusly done for plugins in #59198, but themes were missed.
Follow-up to: [56525].
Props salcode, lakshmananphp.
Fixes#59758.
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git-svn-id: http://core.svn.wordpress.org/trunk@56758 1a063a9b-81f0-0310-95a4-ce76da25c4cd