build(deps): Bump google.golang.org/grpc from 1.67.1 to 1.68.0 #74718

Job	Run time
split-test-files	23s
test-integration	9m 5s
test-system	12m 56s
test-clientv2	1m 36s
test-core	39s
test-sim-nondeterminism	3m 49s
test-coretesting	26s
test-depinject	2m 23s
test-errors	44s
test-math	44s
test-schema-testing	34s
test-collections	39s
test-schema	43s
test-indexer-postgres	32s
test-simapp	55s
test-simapp-v2	5m 24s
test-collections-protocodec	31s
test-confix	1m 17s
test-cosmovisor	1m 58s
test-hubl	1m 8s
test-orm	1m 14s
test-log	44s
test-store	1m 35s
test-store-v2	51s
test-x-accounts	1m 39s
test-x-accounts-base	38s
test-x-accounts-lockup	34s
test-x-accounts-multisig	1m 33s
test-x-circuit	1m 16s
test-x-distribution	1m 31s
test-x-evidence	1m 21s
test-x-feegrant	1m 27s
test-x-nft	1m 20s
test-x-protocolpool	1m 19s
test-x-tx	1m 16s
test-x-authz	1m 32s
test-x-bank	1m 42s
test-x-gov	1m 42s
test-x-group	1m 31s
test-x-mint	1m 23s
test-x-params	1m 23s
test-x-staking	1m 44s
test-x-upgrade	1m 44s
test-x-consensus	1m 34s
test-x-epochs	1m 31s
test-x-slashing	1m 18s
tests (00)	7m 17s
tests (01)	3m 16s
tests (02)	3m 8s
tests (03)	3m 49s
repo-analysis	2m 1s
	1h 41m 19s

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