depends: update qt 5.12 url to archive location #26633

QT 5.12 cannot be downloaded from https://download.qt.io/official_releases/qt/ It can be access from https://download.qt.io/archive/qt/

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ACK 28fc72f7819768db13a01744731dd609553939c8, verified a new link.

ACK 28fc72f7819768db13a01744731dd609553939c8

confirming the old link no longer works

Fetching qtbase-everywhere-src-5.12.11.tar.xz from https://download.qt.io/official_releases/qt/5.12/5.12.11/submodules
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
  0   196    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0
curl: (22) The requested URL returned error: 404
Fetching qtbase-everywhere-src-5.12.11.tar.xz from https://bitcoincore.org/depends-sources

confirming that the new link is appropriate and works:

Fetching qtbase-everywhere-src-5.12.11.tar.xz from https://download.qt.io/archive/qt/5.12/5.12.11/submodules

confirming that the new link's file's hash is stable:

1c1b4e33137ca77881074c140d54c3c9747e845a31338cfe8680f171f0bc3a39  qtbase-everywhere-src-5.12.11.tar.xz

Also performed a static build using depends and ran the gui just fine.