fix(integrations): await the deploy inside the await-using scope

Returning the bare promise let Deployer's asyncDispose run before the
deploy settled, tearing down the wallet and any auto proof-server
container while proving was still in flight.

Author: 0xisk

tests/integrations/_harness/deployer.ts

@@ -72,5 +72,5 @@ export async function deployFixture(
     privateStateProvider:
       overrides.privateStateProvider ?? harnessPrivateStateProvider(),
   });
-  return overrides.dryRun ? deployer.dryRun() : deployer.deploy();
+  return overrides.dryRun ? await deployer.dryRun() : await deployer.deploy();
 }