Bump PHP Compat scan to 7.4

WordPress bumped it's minimum version to 7.4 in [57985] but the compatibility scan was still searching for issues that would only happen in 7.2 and 7.3.

See #58719, #63167.


git-svn-id: https://develop.svn.wordpress.org/trunk@60256 602fd350-edb4-49c9-b593-d223f7449a82

Author: aaronjorbin

phpcompat.xml.dist

@@ -66,8 +66,8 @@
 
 	<rule ref="PHPCompatibilityWP"/>
 
-	<!-- WordPress Core currently supports PHP 7.2+. -->
-	<config name="testVersion" value="7.2-"/>
+	<!-- WordPress Core currently supports PHP 7.4+. -->
+	<config name="testVersion" value="7.4-"/>
 
 	<!--
 	#############################################################################