Prepare the 0.23.0 release #243

Job	Run time
Tests (ubuntu-latest, 4.03.0)	5m 57s
Tests (ubuntu-latest, 4.04.0)	6m 7s
Tests (ubuntu-latest, 4.05.0)	6m 5s
Tests (ubuntu-latest, 4.06.0)	6m 5s
Tests (ubuntu-latest, 4.07.0)	6m 7s
Tests (ubuntu-latest, 4.08.0)	4m 32s
Tests (ubuntu-latest, 4.09.0)	3m 59s
Tests (ubuntu-latest, ocaml-variants.4.11.2+fp+flambda)	3m 59s
Tests (ubuntu-latest, 4.11.1)	4m 1s
Tests (ubuntu-latest, 4.12.0)	3m 56s
Tests (ubuntu-latest, 4.13.1)	3m 43s
Tests (ubuntu-latest, 4.14.0)	3m 58s
Tests (ubuntu-latest, 5.0.0)	4m 2s
Tests (ubuntu-latest, 5.1.0)	3m 52s
Tests (ubuntu-latest, 5.2.0)	3m 49s
Tests (windows-latest, 4.13.1)	6m 25s
Tests (macos-latest, 4.13.1)	3m 55s
	1h 20m 32s

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