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
Reviewed by desrosj, williampatton.
Merges [50507] to the 5.7 branch.
Fixes#52704.
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* Remove `WordPress` from `Requires at least` headers.
* Ensure the `Requires at least` and `Requires PHP` headers are present in the `style.css` file.
Follow-up to [46676], which updated `style-rtl.css`, but not `style.scss` or `style.css`.
See #48517.
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