feat(spy): warn if mock used with a missing attribute (#218) #863

Job	Run time
Lint and type checks	21s
Test Python 3.7 on Ubuntu	28s
Test Python 3.8 on Ubuntu	27s
Test Python 3.9 on Ubuntu	24s
Test Python 3.10 on Ubuntu	22s
Test Python 3.11 on Ubuntu	31s
Test Python 3.12 on Ubuntu	1m 3s
Test Python 3.7 on Windows	44s
Test Python 3.8 on Windows	45s
Test Python 3.9 on Windows	48s
Test Python 3.10 on Windows	58s
Test Python 3.11 on Windows	47s
Test Python 3.12 on Windows	2m 33s
Test Python 3.7 on macOS	41s
Test Python 3.8 on macOS	46s
Test Python 3.9 on macOS	2m 54s
Test Python 3.10 on macOS	48s
Test Python 3.11 on macOS	1m 4s
Test Python 3.12 on macOS	1m 59s
Build assets and deploy on tags	10s
	18m 33s

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