Upgrade gas-client (#164)

Uses latest UMD build for gas-client and externalizes the package to further reduce client bundle size

src/client/utils/serverFunctions.ts

@@ -3,7 +3,7 @@ import * as publicServerFunctions from '../../server';
 
 const { serverFunctions } = new GASClient<typeof publicServerFunctions>({
   // this is necessary for local development but will be ignored in production
-  allowedDevelopmentDomains: origin =>
+  allowedDevelopmentDomains: (origin) =>
     /https:\/\/.*\.googleusercontent\.com$/.test(origin),
 });