feat(ui/MSALoginDialog): use libqrencode for qr codes

`qrcodegen` isn't available in most repositories, package discovery
scripts for it are maintained in a different repository, and they are
bugged for Windows at least. This basically forces us into vendoring it,
which isn't cool; libqrencode seems like viable alternative used by many
more apps

Signed-off-by: Seth Flynn <getchoo@tuta.io>

.github/actions/setup-dependencies/linux/action.yml

@@ -11,6 +11,7 @@ runs:
         sudo apt-get -y install \
           dpkg-dev \
           ninja-build extra-cmake-modules scdoc \
+          libqrencode-dev \
           appstream libxcb-cursor-dev
 
     - name: Setup AppImage tooling

.github/actions/setup-dependencies/windows/action.yml

@@ -79,6 +79,7 @@ runs:
           qt6-5compat:p
           qt6-networkauth:p
           cmark:p
+          qrencode:p
           tomlplusplus:p
           quazip-qt6:p