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Pin CI ubuntu version, update CHANGELOG #1549

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Run time

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Job	Run time
test (3.8)	1m 22s
test (3.9)	1m 23s
test (3.10)	1m 19s
test (3.11)	1m 16s
test (3.12)	1m 24s
Finish Coveralls	0s
	6m 44s