chore: Deprecate QueryUpgradedConsensusState (cosmos#9906) (cosmos#9909)

Closes: cosmos#9855

Deprecate `QueryUpgradedConsensusState` from x/upgrade

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(cherry picked from commit 0bcce5d)

Co-authored-by: likhita-809 <78951027+likhita-809@users.noreply.github.com>

CHANGELOG.md

@@ -41,6 +41,10 @@ Ref: https://keepachangelog.com/en/1.0.0/
 
 * [\#9860](https://github.com/cosmos/cosmos-sdk/pull/9860) Emit transaction fee in ante handler fee decorator. The event type is `tx` and the attribute is `fee`.
 
+ ### Deprecated
+
+* (x/upgrade) [\#9906](https://github.com/cosmos/cosmos-sdk/pull/9906) Deprecate `UpgradeConsensusState` gRPC query since this functionality is only used for IBC, which now has its own [IBC replacement](https://github.com/cosmos/ibc-go/blob/2c880a22e9f9cc75f62b527ca94aa75ce1106001/proto/ibc/core/client/v1/query.proto#L54)
+
 ## [v0.43.0](https://github.com/cosmos/cosmos-sdk/releases/tag/v0.43.0) - 2021-08-10
 
 ### Features