chore: drop jmustache dependency until it is fully audited (AIC-2661) #449

Job	Run time
test-packaging	5m 12s
test-platforms-and-versions (ubuntu-latest, 8)	3m 22s
test-platforms-and-versions (ubuntu-latest, 17)	3m 53s
test-platforms-and-versions (ubuntu-latest, 19)	3m 49s
test-platforms-and-versions (ubuntu-latest, 11)	3m 58s
test-contract-tests	4m 24s
	24m 38s

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