Update grafana/grafana-arm32v7-linux Docker tag to v6.4.4
Update grafana/grafana-arm32v7-linux Docker tag to v6.4.4

mwutzke/faucet,anarkiwi/faucet,trungdtbk/faucet,faucetsdn/faucet,anarkiwi/faucet,REANNZ/faucet,faucetsdn/faucet,gizmoguy/faucet,gizmoguy/faucet,mwutzke/faucet,shivarammysore/faucet,shivarammysore/faucet,REANNZ/faucet,trungdtbk/faucet