Changeset 50507

Bundled Themes: Bump theme version numbers for WordPres 5.7.

This updates all new default themes to new versions, which will be released shortly after WordPress 5.7. The new versions are:

• Twenty Twenty-One: 1.2
• Twenty Twenty: 1.7
• Twenty Nineteen: 2.0
• Twenty Seventeen: 2.6
• Twenty Sixteen: 2.4
• Twenty Fifteen: 2.9
• Twenty Fourteen: 3.1
• Twenty Thirteen: 3.3
• Twenty Twelve: 3.4
• Twenty Eleven: 3.7
• Twenty Ten: 3.3

Fixes #52704.