Add test update_spend_taproot #1851

Job	Run time
linter_gui	1m 34s
linter	32s
unit_tests (1.63, ubuntu-latest)	1m 42s
unit_tests (1.63, macOS-latest)	2m 52s
unit_tests (1.63, windows-latest)	2m 50s
unit_tests (nightly, ubuntu-latest)	53s
unit_tests (nightly, macOS-latest)	2m 27s
unit_tests (nightly, windows-latest)	1m 46s
unit_tests_gui (1.65.0, ubuntu-latest)	3m 59s
unit_tests_gui (1.65.0, macOS-latest)	5m 12s
unit_tests_gui (1.65.0, windows-latest)	5m 43s
unit_tests_gui (nightly, ubuntu-latest)	2m 41s
unit_tests_gui (nightly, macOS-latest)	3m 58s
unit_tests_gui (nightly, windows-latest)	4m 25s
	40m 34s

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