feat: Implement PR feedback for Upgopher script

- Update Debian version from 12 to 13
- Replace manual download/extraction with fetch_and_deploy_gh_release function
- Remove redundant curl/wget installation (already in core dependencies)
- Remove unnecessary comments
- Add apt clean -y to cleanup section
- Modernize apt-get commands to apt
- Update success message to 'Updated successfully!'
- Fix asset pattern to match release files (upgopher_*_linux_amd64.tar.gz)

frontend/public/json/upgopher.json

@@ -23,7 +23,7 @@
         "ram": 512,
         "hdd": 4,
         "os": "Debian",
-        "version": "12"
+        "version": "13"
       }
     }
   ],