chore(x/staking): use `cosmossdk.io/core/codec` instead of `github.com/cosmos/cosmos-sdk/codec` #77563

Job	Run time
split-test-files	12s
test-clientv2	26s
test-core	26s
test-coretesting	26s
test-depinject	34s
test-errors	30s
test-integration	5m 29s
test-math	41s
test-sim-nondeterminism	24s
test-collections	26s
test-collections-protocodec	24s
test-confix	33s
test-cosmovisor	36s
test-indexer-postgres	24s
test-orm	24s
test-schema	27s
test-schema-testing	26s
test-simapp-v2	13m 16s
test-hubl	24s
test-log	30s
test-store	25s
test-store-v2	30s
test-x-accounts	26s
test-x-accounts-base	26s
test-x-accounts-lockup	31s
test-x-accounts-multisig	24s
test-x-circuit	32s
test-x-distribution	32s
test-x-evidence	26s
test-x-feegrant	23s
test-x-gov	31s
test-x-group	27s
test-x-nft	30s
test-x-slashing	27s
test-x-protocolpool	31s
test-x-tx	23s
test-x-upgrade	35s
test-x-authz	31s
test-tools-benchmark	31s
test-x-bank	31s
test-x-consensus	23s
test-x-epochs	30s
test-x-mint	23s
test-x-staking	56s
tests (00)	8m 7s
tests (01)	3m 36s
tests (02)	3m 56s
tests (03)	4m 14s
repo-analysis	30s
	59m 5s

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