chore: prepare for release 1.6.0 #271

Job	Run time
Static analysis	25s
Coding standards	14s
Code coverage	18s
Functional tests (8.1)	39s
Unit tests (8.1, macos-latest, highest)	1m 12s
Functional tests (8.2)	32s
Unit tests (8.1, ubuntu-latest, highest)	20s
Functional tests (8.3)	34s
Unit tests (8.1, windows-latest, highest)	40s
Functional tests (8.4)	31s
Unit tests (8.2, macos-latest, lowest)	1m 8s
Unit tests (8.2, macos-latest, highest)	1m 13s
Unit tests (8.2, ubuntu-latest, lowest)	14s
Unit tests (8.2, ubuntu-latest, highest)	13s
Unit tests (8.2, windows-latest, lowest)	49s
Unit tests (8.2, windows-latest, highest)	48s
Unit tests (8.3, macos-latest, lowest)	1m 9s
Unit tests (8.3, macos-latest, highest)	1m 9s
Unit tests (8.3, ubuntu-latest, lowest)	13s
Unit tests (8.3, ubuntu-latest, highest)	19s
Unit tests (8.3, windows-latest, lowest)	47s
Unit tests (8.3, windows-latest, highest)	47s
Unit tests (8.4, macos-latest, lowest)	1m 17s
Unit tests (8.4, macos-latest, highest)	1m 6s
Unit tests (8.4, ubuntu-latest, lowest)	13s
Unit tests (8.4, ubuntu-latest, highest)	19s
Unit tests (8.4, windows-latest, lowest)	52s
Unit tests (8.4, windows-latest, highest)	1m 1s
	19m 2s

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