Tests

f-string guidelines using Flynt (#1406) #1305

Job	Run time
(ubuntu-latest, Py3.8, sk0.23.1, sk-only:true)	6m 22s
(ubuntu-latest, Py3.9, sk1.3.*, sk-only:true)	8m 12s
(ubuntu-latest, Py3.9, sk1.5.*, sk-only:true)	6m 13s
(windows-latest, Py3.8, sk0.24.*, sk-only:false)	9m 33s
(ubuntu-latest, Py3.8, sk0.23.1, sk-only:false)	9m 14s
(ubuntu-latest, Py3.9, sk0.24, sk-only:true)	8m 8s
(ubuntu-latest, Py3.9, sk1.1.*, sk-only:true)	7m 36s
(ubuntu-latest, Py3.9, sk1.4.*, sk-only:true)	7m 58s
(ubuntu-latest, Py3.9, sk1.0.*, sk-only:true)	7m 51s
(ubuntu-latest, Py3.9, sk1.2.*, sk-only:true)	7m 45s
	1h 18m 52s

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