message: chore: remove freezer from CHANGELOG
diff: ### Features
  -* #2297: Chain freezer (@zhangsoledad)
  * #2382: Permit load cell data from memory (@zhangsoledad)
  * #2343: Add RPC `get_raw_tx_pool` (@zhangsoledad)
  * #2347: Add RPC to get consensus parameters (@zhangsoledad)
  