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Update changelog for 1.20.0 release #1402

Job	Run time
Integration tests against latest Connect	3m 29s
test-jupyter	7m 39s
prerelease-test	2m 10s
test (py3.7 ubuntu-latest)	1m 30s
test (py3.8 ubuntu-latest)	1m 23s
test (py3.9 ubuntu-latest)	1m 28s
test (py3.10 ubuntu-latest)	1m 50s
test (py3.11 ubuntu-latest)	1m 19s
test (py3.9 macos-latest)	2m 21s
test (py3.9 windows-latest)	6m 27s
docs	1m 35s
distributions	1m 4s
dispatch	0s
	32m 15s

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