chore: upgrade Solidity version from 0.8.20 to 0.8.28 #136

Job	Run time
verify (OperatorRegistryV1_1, OperatorRegistryV1_1.conf)	29s
verify (AllowlistV1, AllowlistV1.conf)	39s
verify (OperatorRegistryV1_2_4loops_v2, OperatorRegistryV1_2_4loops_v2.conf)	27s
verify (OperatorRegistryV1_3, OperatorRegistryV1_3.conf)	27s
verify (RedeemManagerV1, RedeemManagerV1.conf)	29s
verify (OperatorRegistryV1_2_2loops, OperatorRegistryV1_2_2loops.conf)	49s
verify (RiverV1, RiverV1.conf)	27s
verify (OperatorRegistryV1_2_4loops_v1, OperatorRegistryV1_2_4loops_v1.conf)	28s
verify (SharesManagerV1, SharesManagerV1.conf)	31s
	4m 46s

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