Merge bitcoin/bitcoin#22054: depends: Bump Qt version to 5.12.11

fa416cea84d8f1528fc7ecf9a04654aae75ac3f5 depends: Bump Qt version to 5.12.11 (Hennadii Stepanov)

Pull request description:

  Qt 5.12.11:
  - [fixes](https://github.com/qt/qtbase/commit/c5d904639dbd690a36306e2b455610029704d821) macOS related [QTBUG-87014](https://bugreports.qt.io/browse/QTBUG-87014), and the `fix_bigsur_drawing.patch` (which is our workaround for QTBUG-87014) could be dropped
  - [upgrades](https://github.com/qt/qtbase/commit/00326c9dc1ec6c80679347859c2fe01d4837b061) supported macOS SDK to 11.0, and removes related warnings
  - fixes tab widget rendering on macOS Big Sur ([here](https://github.com/qt/qtbase/commit/4d6832d03f31b513ff2e3517197691bedddaccdf) and [here](https://github.com/qt/qtbase/commit/28b015342d000b8487c853153f1d93606d3c2add)):
    - master (5.12.10)
  ![DeepinScreenshot_select-area_20210525122725](https://user-images.githubusercontent.com/32963518/119474470-dd24a180-bd54-11eb-82e6-ca4d39b0b177.png)
  ![DeepinScreenshot_select-area_20210525123634](https://user-images.githubusercontent.com/32963518/119475548-ebbf8880-bd55-11eb-9c13-477016f8c23b.png)
    - this PR (5.12.11)
  ![Screenshot from 2021-05-25 12-28-02](https://user-images.githubusercontent.com/32963518/119474537-ed3c8100-bd54-11eb-8efe-7fe5ccae8a98.png)

  Closes https://github.com/bitcoin-core/gui/issues/136.

ACKs for top commit:
  goums:
    ACK fa416cea84d8f1528fc7ecf9a04654aae75ac3f5
  fanquake:
    ACK fa416cea84d8f1528fc7ecf9a04654aae75ac3f5 - merging this now to move it out of the way of other Qt related changes.

Tree-SHA512: 4e621b214f05d12a060757fadf2fa103c09b594d7b1c2ad9200f550e55c1e1fdf66f2f830550e724b9277448e5480be256cb0003f4597902944400e16c4a68b8

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