Update Kiosk package manifest to new standard

[thounyy]

Update Move.lock for the Kiosk package on mainnet and testnet using

sui move manage-package --environment "$(sui client active-env)" \
  --network-id "$(sui client chain-identifier)" \
  --original-id 'PUBLISHED_ID' \
  --latest-id 'UPGRADED_ID' \
  --version-number 'VERSION'

Remove published-at from Move.toml.

Current format prevent from using a single package manifest for both mainnet and testnet.

[leecchh]

Thank you, addressed here #52

[thounyy]

bumping this @leecchh bc it hasn't been updated on the testnet branch and the address needs to be updated in Move.toml on /main

[thounyy]

done here #59 and here #60