Pin CI ubuntu version, update CHANGELOG #1559

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Run time

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Job	Run time
test (3.8)	7m 45s
test (3.9)	7m 28s
test (3.10)	7m 49s
test (3.11)	7m 53s
test (3.12)	9m 28s
Finish Coveralls	2s
	40m 25s