chore: update CHANGELOG for v1.2.0 #2211

Job	Run time
Labels	21s
Update CHANGELOG (on release)	0s
Create changelog fragment	14s
Doc style	11s
Code style	47s
Doc building	3m 1s
Build and smoke tests (ubuntu-latest, 3.10, false)	33s
Build and smoke tests (ubuntu-latest, 3.11, false)	33s
Build and smoke tests (ubuntu-latest, 3.12, false)	22s
Build and smoke tests (windows-latest, 3.10, false)	1m 43s
Build and smoke tests (windows-latest, 3.11, false)	1m 44s
Build and smoke tests (windows-latest, 3.12, false)	1m 54s
Build library	13s
Doc dev version deploy	0s
Release project to private PyPI, public PyPI and GitHub	0s
Doc stable version deploy	0s
	11m 36s

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