CI: add timeout to tests #90

Job	Run time
continuous-integration (8.10.7)	6m 2s
continuous-integration (8.10.7)	6m 2s
continuous-integration (8.10.7)	6m 2s
continuous-integration (9.0.2)	4m 50s
continuous-integration (9.0.2)	4m 43s
continuous-integration (9.0.2)	5m 52s
continuous-integration (9.2.8)	3m 12s
continuous-integration (9.2.8)	3m 12s
continuous-integration (9.2.8)	3m 12s
continuous-integration (9.4.5)	5m 57s
continuous-integration (9.4.5)	5m 57s
continuous-integration (9.4.5)	5m 57s
continuous-integration (9.6.4)	6m 4s
continuous-integration (9.6.4)	6m 4s
continuous-integration (9.6.4)	6m 4s
continuous-integration (9.8.2)	9m 15s
continuous-integration (9.8.2)	9m 15s
continuous-integration (9.8.2)	9m 15s
continuous-integration (9.10.1)	4m 43s
continuous-integration (9.10.1)	4m 43s
continuous-integration (9.10.1)	4m 43s
continuous-integration (9.12.1, --allow-newer=base --allow-newer=template-haskell --allow-newer=g...	6m 52s
continuous-integration (9.12.1, --allow-newer=base --allow-newer=template-haskell --allow-newer=g...	6m 52s
continuous-integration (9.12.1, --allow-newer=base --allow-newer=template-haskell --allow-newer=g...	6m 52s
	2h 21m 40s

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