Hi @dww,
1. Patch #19 doesn't apply with 9.1.x dist.
2. I went through core/m...

Hi @dww,
1. Patch #19 doesn't apply with 9.1.x dist.
2. I went through core/modules/update/update.install and checked what was changed in #19.
3. "\Drupal::url" has been replaced by "Url::fromRoute", so there is no requirement of that patch.
4. Also in core/modules/update/update.module there is no requirement of the changes.