Update version to 42.1.0, add CHANGELOG (#12986) #12989
Merged
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Which issue does this PR close?
Part of #12813
Rationale for this change
I am making a 42.1.0 release and main should also reflect the release
What changes are included in this PR?
Port changes from #12986
42.1.0
Are these changes tested?
Are there any user-facing changes?