add changelog entry

Author: GAtom22

CHANGELOG.md

@@ -107,6 +107,7 @@ Every module contains its own CHANGELOG.md. Please refer to the module you are i
 * (crypto) [#19691](https://github.com/cosmos/cosmos-sdk/pull/19691) Fix tx sign doesn't throw an error when incorrect Ledger is used.
 * [#19833](https://github.com/cosmos/cosmos-sdk/pull/19833) Fix some places in which we call Remove inside a Walk.
 * [#19851](https://github.com/cosmos/cosmos-sdk/pull/19851) Fix some places in which we call Remove inside a Walk (x/staking and x/gov).
+* (baseapp) [#19970](https://github.com/cosmos/cosmos-sdk/pull/19970) Fix default config values to use no-op mempool as default.
 
 ### API Breaking Changes