Bump dotenv from 8.6.0 to 16.4.5 in /solidity #1646

Job	Run time
check	3m 54s
audit	9s
rustfmt	8s
clippy	4m 4s
test	13m 11s
cross-armv7	1m 15s
cross-aarch64	51s
integration-test-five-nodes	14m 16s
integration-test-debts	17m 4s
integration-test-multi-exit	12m 47s
integration-test-db-migration	12m 23s
integration-test-althea-payment	16m 11s
integration-test-eth-payments	15m 0s
integration-test-validate-contract	12m 17s
	2h 3m 30s

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