Merge pull request #16 from oracle/bh/GCN-3517

[GCN-3517] Update gcn-cli homebrew cask

Casks/gcn.rb

@@ -1,24 +1,23 @@
 cask 'gcn' do
     arch arm: 'aarch64', intel: 'amd64'
-   
-    version '4.0.7'
-    sha256 arm:   'fac59e5b8b7c2f593cd258a16c242153251892b1e8e8bbae3309d58fa30a2718',
-           intel: '32ebab2e1b6c0f6899a40beeaf09ea45710a0194bcb2ae2168ac9554f6ac1fba'
-  
+
+    version '4.2.1'
+    sha256 arm:   '0ca0b25d760ae1c5faa1bbea4b3174b8ec5d35b4a5012dd584b685b3634b9ff5',
+           intel: 'cac348f3f34318d624c99ebc22224354ca44f384e3cc77bda4249d765ebefbe8'
+
     url "https://github.com/oracle/gcn/releases/download/#{version}/gcn-cli-#{version}-macos-#{arch}.tar.gz"
-    appcast 'https://github.com/oracle/gcn/releases.atom'
     name 'Graal Cloud Native'
     homepage 'https://www.graal.cloud/gcn/'
-  
+
     binary "gcn-cli-#{version}-macos-#{arch}/gcn"
     caveats <<~EOS
       On macOS Catalina or later, you may get a warning when you use the Graal Cloud
       Native installation for the first time. This warning can be disabled by running
       the following command:
         sudo xattr -d com.apple.quarantine "#{staged_path}/gcn-cli-#{version}-macos-#{arch}/gcn"
-  
+
       Graal Cloud Native is licensed under the Apache License Version 2.0:
         https://github.com/oracle/gcn/blob/main/LICENSE.txt
-  
+
     EOS
 end