Prepare liana v7.0 release #2421

Job	Run time
linter_gui	1m 47s
linter	32s
unit_tests (1.63, ubuntu-latest)	3m 8s
unit_tests (1.63, macOS-latest)	2m 56s
unit_tests (1.63, windows-latest)	4m 30s
unit_tests (nightly, ubuntu-latest)	1m 4s
unit_tests (nightly, macOS-latest)	1m 14s
unit_tests (nightly, windows-latest)	2m 7s
unit_tests_gui (1.70.0, ubuntu-latest)	3m 57s
unit_tests_gui (1.70.0, macOS-latest)	2m 34s
unit_tests_gui (1.70.0, windows-latest)	7m 37s
unit_tests_gui (nightly, ubuntu-latest)	2m 54s
unit_tests_gui (nightly, macOS-latest)	2m 15s
unit_tests_gui (nightly, windows-latest)	6m 23s
	42m 58s

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