Follow this format to get the latest wasm.gz file of any IC canister:
https://download.dfinity.systems/ic/$IC_VERSION/canisters/$CANISTER_NAME_IN_THE_LIST
With:
IC_VERSION as the latest release commit that can be found on the IC Data Dashboard releases
CANISTER_NAME_IN_THE_LIST as the canister name in this list.
In this case, the last IC version is bb76748d1d225c08d88037e99ca9a066f97de496 and the canister name is governance-canister.wasm.gz:
https://download.dfinity.systems/ic/bb76748d1d225c08d88037e99ca9a066f97de496/canisters/governance-canister.wasm.gz