Merge bitcoin-core/gui#838: qt6: Handle deprecated `QLocale::nativeCo… #172

Job	Run time
Win64 native, VS 2022	1h 16m 55s
test each commit	0s
macOS 14 native, arm64, no depends, sqlite only, gui	16m 10s
ASan + LSan + UBSan + integer, no depends, USDT	44m 42s
	2h 17m 47s

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