Continuous Integration

Chore: Clean up support for Go versions < 1.12 #91

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Run time

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Job	Run time
lint	40s
integration (1.18.x)	1m 20s
integration (1.19.x)	1m 10s
integration (1.20.x)	1m 28s
integration (1.21.x)	1m 16s
	5m 54s