Bump @openzeppelin/contracts from 4.3.1 to 5.1.0 in /solidity #2184

Job	Run time
check	2m 34s
test	5m 53s
clippy	3m 47s
integration-test-debts	11m 59s
integration-test-althea-payment	14m 16s
audit	2m 53s
integration-test-eth-payments	15m 35s
integration-test-five-nodes	11m 25s
integration-test-multi-exit	12m 57s
integration-test-validate-contract	11m 19s
rustfmt	3s
integration-test-db-migration	11m 43s
cross-aarch64	4m 33s
cross-armv7	4m 39s
	1h 53m 36s

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