Prepare release 1.6.1 #119

Job	Run time
Start EC2 runner	1m 12s
Install deps and run checks	4m 55s
Run tests / Decide Slack report	1s
Run tests / Prepare versions and OS	3s
Run tests / Start EC2 runner (Linux)	3m 56s
Run tests / Python ${{ matrix.python_version }} (macOS, intel)	0s
Run tests / Python 3.8 (Linux)	51m 46s
Run tests / Python 3.9 (Linux)	52m 44s
Run tests / Python 3.10 (Linux)	52m 48s
Run tests / Stop EC2 runner (Linux)	7s
Run tests / Build Status (Linux)	1s
Run tests / provenance / detect-env	3s
Run tests / provenance / generator	14s
Run tests / Slack report	0s
Run tests / Stop EC2 failure Slack alert	0s
Run tests / provenance / upload-assets	0s
Run tests / provenance / final	1s
Push new tag and branch	8s
Release package and artifacts	19m 17s
Stop EC2 runner	7s
Send Slack notification	8s
	3h 7m 31s

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