[13027]: Add changelog entry.

Author: SpicyLemon

CHANGELOG.md

@@ -42,6 +42,7 @@ Ref: https://keepachangelog.com/en/1.0.0/
 * (x/authz) [#12648](https://github.com/cosmos/cosmos-sdk/pull/12648) Add an allow list, an optional list of addresses allowed to receive bank assests via authz MsgSend grant.
 * (sdk.Coins) [#12627](https://github.com/cosmos/cosmos-sdk/pull/12627) Make a Denoms method on sdk.Coins.
 * (testutil) [#12973](https://github.com/cosmos/cosmos-sdk/pull/12973) Add generic `testutil.RandSliceElem` function which selects a random element from the list.
+* (x/authz) [#13047](https://github.com/cosmos/cosmos-sdk/pull/13047) Add a GetAuthorization function to the keeper.
 
 ### Improvements