Prepare 3.21.0 #686

Job	Run time
Tests (ubuntu-latest, 7.2, lowest)	38s
Tests (ubuntu-latest, 7.2, highest)	31s
Tests (ubuntu-latest, 7.3, lowest)	31s
Tests (ubuntu-latest, 7.3, highest)	1m 13s
Tests (ubuntu-latest, 7.4, lowest)	23s
Tests (ubuntu-latest, 7.4, highest)	52s
Tests (ubuntu-latest, 8.0, lowest)	26s
Tests (ubuntu-latest, 8.0, highest)	1m 1s
Tests (ubuntu-latest, 8.1, lowest)	19s
Tests (ubuntu-latest, 8.1, highest)	56s
Tests (ubuntu-latest, 8.2, lowest)	18s
Tests (ubuntu-latest, 8.2, highest)	1m 9s
Tests (windows-latest, 7.2, lowest)	2m 53s
Tests (windows-latest, 7.2, highest)	2m 42s
Tests (windows-latest, 7.3, lowest)	1m 2s
Tests (windows-latest, 7.3, highest)	2m 8s
Tests (windows-latest, 7.4, lowest)	1m 4s
Tests (windows-latest, 7.4, highest)	2m 8s
Tests (windows-latest, 8.0, lowest)	1m 32s
Tests (windows-latest, 8.0, highest)	1m 54s
Tests (windows-latest, 8.1, lowest)	1m 23s
Tests (windows-latest, 8.1, highest)	2m 3s
Tests (windows-latest, 8.2, lowest)	57s
Tests (windows-latest, 8.2, highest)	1m 42s
	29m 45s

Provide feedback