Updating to macOS Monterey 12.3 removed Python 2.7 so Qt5.15.8 iOS build fails immediately to a missing python when running qmake.

10:20:26: Starting: "/Users/<user>/Qt/5.15.8/ios/bin/qmake" /Users/<user>/proj/test/testappqmake/testappqmake.pro -spec macx-ios-clang CONFIG+=iphoneos CONFIG+=device CONFIG+=qml_debug -after
10:20:27: The process "/Users/<user>/Qt/5.15.8/ios/bin/qmake" exited normally.
10:20:27: Starting: "/usr/bin/make" -f /Users/<user>/proj/test/build-testappqmake-Qt_5_15_8_for_iOS-Debug/Makefile qmake_all
/bin/sh: /Users/<user>/Qt/5.15.8/ios/mkspecs/features/uikit/devices.py: /usr/bin/python: bad interpreter: No such file or directory
/Users/<user>/Qt/5.15.8/ios/mkspecs/features/uikit/xcodebuild.mk:77: *** Could not find any device matching '--platform iOS --minimum-deployment-target 12.0'.. Stop.
10:20:27: The process "/usr/bin/make" exited with code 2.
Error while building/deploying project testappqmake (kit: Qt 5.15.8 for iOS)
When executing step "qmake"

More info about python removal: https://macmule.com/2022/01/29/macos-monterey-12-3-will-remove-python-2-7-usr-bin-python/