Update 1password-beta to 6.8.BETA-4 (#3905)

Casks/1password-beta.rb

@@ -1,10 +1,10 @@
 cask '1password-beta' do
-  version '6.8.BETA-3'
+  version '6.8.BETA-4'
-  sha256 '3a875bb6b50a071dc5dd2ad1cc20cf4c6513ba2c69ee65118aa29e132a80ded3'
+  sha256 '95f42a2298c25c421ae697df4a9ff779e3bf61c80852980fb7d9019e6a06c4d2'
 
   url "https://cache.agilebits.com/dist/1P/mac4/1Password-#{version}.zip"
   appcast 'https://app-updates.agilebits.com/product_history/OPM4',
-          checkpoint: '8a58ba649363b0fc4aa5b1f1c6c59a2a07e3e686a5ee0851a7cb9e799461c6a1'
+          checkpoint: '1be3642b91cda969ba08b81f6af8902ee8f4bfda22c8252bcd077493b6981184'
   name '1Password'
   homepage 'https://agilebits.com/downloads'