Bump eslint from 7.32.0 to 9.15.0 in /solidity #2220

Job	Run time
check	2m 32s
test	6m 0s
audit	9s
rustfmt	7s
clippy	3m 50s
integration-test-althea-payment	2m 13s
integration-test-debts	2m 15s
integration-test-eth-payments	2m 39s
integration-test-db-migration	2m 16s
integration-test-five-nodes	2m 28s
integration-test-multi-exit	2m 12s
integration-test-validate-contract	2m 42s
cross-aarch64	4m 33s
cross-armv7	4m 22s
	38m 18s

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