update make_debian to install specific version of rchardet ruby gem #667

Job	Run time
clippy	2m 22s
build	2m 27s
fmt	17s
tests (coverage-map)	1m 36s
tests (ingest)	2m 12s
tests (coverage-point-calculator)	1m 32s
tests (reward-scheduler)	43s
tests (task-manager)	54s
tests-postgres (boost-manager)	2m 17s
tests-postgres (file-store)	2m 2s
tests-postgres (iot-config)	2m 12s
tests-postgres (iot-packet-verifier)	3m 24s
tests-postgres (iot-verifier)	2m 19s
tests-postgres (mobile-config)	2m 3s
tests-postgres (mobile-packet-verifier)	2m 42s
tests-postgres (mobile-verifier)	2m 51s
build-release	14m 37s
	46m 30s

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