Deployment of the Vault, Balancer V2's core contract.
Note that the Authorizer used in the Vault's original deployment may change over time: the current Authorizer should be retrieved by calling vault.getAuthorizer() instead.
Aditionally, the WETH argument may represent different things in different network: on Ethereum mainnet it is the WETH contract, whereas e.g. in Polygon mainnet it is the WMATIC contract.