v1.3.0

• upgrade golang to 1.21
• fix jsonnet import abs path on windows
• upgrade github.com/gorilla/websocket to v1.5.1
• upgrade github.com/gin-gonic/gin to v1.9.1
• "attachment;filename="+url.PathEscape(name)
• upgrade angular to 14
• angular target to es2020
• rm require.min.js
• upgrade noVNC to 1.4
• upgrade xterm to 5.3.0