Changeset 53418 for trunk

Bundled themes: Bump versions for WordPress 6.0 release.

Bump bundled theme version numbers in preparation for the WordPress 6.0 release. Each theme's _tested up to_ file header has been increased to indicate WordPress 6.0 support.

The new version numbers are:

• Twenty Ten: 3.7
• Twenty Eleven: 4.1
• Twenty Twelve: 3.7
• Twenty Thirteen*: 3.7
• Twenty Fourteen: 3.4
• Twenty Fifteen*: 3.2
• Twenty Sixteen*: 2.7
• Twenty Seventeen*: 3.0
• Twenty Nineteen: 2.3
• Twenty Twenty: 2.0
• Twenty Twenty-One: 1.6

An asterisk indicates the theme includes assets requiring a manual version bump, this is set to the reverse date format of the release day: 20220524.

Follow up to [53286] in which the Twenty Twenty-Two theme version was bumped to 1.2.

Props peterwilsoncc, desrosj, costdev, mehedi890.
Fixes #55754.