Minimum PHP version incorrect as of WordPress 6.6

[jonsurrell]

WordPress 6.6 changed the minimum supported PHP version to PHP 7.2.

​The requirements page continues to claim 7.0+:

WordPress also works with PHP 7.0+ and MySQL 5.5.5+.

​The compatibility page notes that WordPress 6.6 dropped support for versions 7.0 and 7.1.

WordPress 6.6 changed the minimum supported PHP version to PHP 7.2.
​The requirements page continues to claim 7.0+:
WordPress also works with PHP 7.0+ and MySQL 5.5.5+.
​The compatibility page notes that WordPress 6.6 dropped support for versions 7.0 and 7.1.

Fixes https://meta.trac.wordpress.org/ticket/7723

Props pkevan

### Screenshots

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### How to test the changes in this Pull Request:

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[jonsurrell]

Patch updating wordpress.org/public_html/wp-content/mu-plugins/pub/servehappy-config.php minimum PHP version.

[jonsurrell]

@clorith ​mentioned that the PR is not sufficient to update the constants and pointed me in the correct direction. I've attached a patch that should address the problem by updating the value of the constant.

[dd32]

In 13936:

ServeHappy: Bump minimum WordPress supported PHP to 7.2.24.

Props jonsurrell, Clorith, JavierCasares, dd32.
See ​https://core.trac.wordpress.org/browser/tags/6.6/src/wp-includes/version.php
Fixes #7723.