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Sets release notes for 1.21.0 #1523

Job	Run time
test-jupyter	9m 48s
test (py3.7 ubuntu-latest)	2m 0s
prerelease-test	1m 51s
Integration tests against latest Connect	4m 37s
test (py3.8 ubuntu-latest)	1m 34s
test (py3.9 ubuntu-latest)	1m 28s
test (py3.10 ubuntu-latest)	1m 28s
test (py3.11 ubuntu-latest)	1m 51s
test (py3.12 ubuntu-latest)	4m 14s
test (py3.9 macos-latest)	2m 14s
test (py3.9 windows-latest)	4m 19s
distributions	1m 26s
docs	45s
dispatch	0s
	37m 35s

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