6.8.5 tag reporting incorrect version

[jessedyck]

https://github.com/pantheon-systems/wordpress-composer/blob/6.8.5/wp-includes/version.php#L19

It seems the entirety of the tag was updated correctly except for this file - I verified by reinstalling core using wp core download --version=6.8.5 --force and git only reports this one change.

See also: #43