Run tests and lint

Use conda version of `libsemigroups` in the CI #737

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Run time

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Job	Run time
macOS-latest	3m 43s
ubuntu-latest	5m 31s
macOS-latest	3m 56s
macOS-latest	3m 51s
ubuntu-latest	5m 17s
ubuntu-latest	6m 11s
macOS-latest	3m 49s
macOS-latest	5m 16s
ubuntu-latest	8m 57s
ubuntu-latest	6m 44s
	53m 15s