Update appcast.xml

Author: intitni

appcast.xml

@@ -12,7 +12,7 @@
       <sparkle:releaseNotesLink>
         https://github.com/intitni/CopilotForXcode/releases/tag/0.30.5.beta
       </sparkle:releaseNotesLink>
-      <enclosure url="https://github.com/intitni/CopilotForXcode/releases/download/0.30.4.beta/Copilot.for.Xcode.0.30.5.beta.1.zip" length="39851978" type="application/octet-stream" sparkle:edSignature="evAVcnvG1VOuflP2FIqrnDdGnq0w+piJ7RSRP54+Rd4EbXIgsVPG7i0oDDtjgxL2zBxaKBhwHECQh3BE+eiwBg=="/>
+      <enclosure url="https://github.com/intitni/CopilotForXcode/releases/download/0.30.5.beta/Copilot.for.Xcode.0.30.5.beta.1.zip" length="39851978" type="application/octet-stream" sparkle:edSignature="evAVcnvG1VOuflP2FIqrnDdGnq0w+piJ7RSRP54+Rd4EbXIgsVPG7i0oDDtjgxL2zBxaKBhwHECQh3BE+eiwBg=="/>
     </item>
 
     <item>