Bump solidity-coverage from 0.7.22 to 0.8.14 in /solidity #2224

Job	Run time
check	2m 37s
test	5m 56s
clippy	3m 50s
integration-test-althea-payment	15m 29s
audit	8s
integration-test-debts	11m 20s
integration-test-eth-payments	12m 53s
integration-test-five-nodes	11m 11s
rustfmt	7s
integration-test-db-migration	11m 21s
integration-test-validate-contract	10m 27s
integration-test-multi-exit	11m 42s
cross-armv7	4m 28s
cross-aarch64	4m 48s
	1h 46m 17s

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