cmd/tsconnect: switch to non-beta versions of xterm and related packages

xterm 5.0 was released a few weeks ago, and it picks up
xtermjs/xterm.js#4069, which was the main reason why we were on a 5.0
beta.

Signed-off-by: Mihai Parparita <mihai@tailscale.com>

cmd/tsconnect/package.json

@@ -10,9 +10,9 @@
     "qrcode": "^1.5.0",
     "tailwindcss": "^3.1.6",
     "typescript": "^4.7.4",
-    "xterm": "5.0.0-beta.58",
-    "xterm-addon-fit": "^0.5.0",
-    "xterm-addon-web-links": "0.7.0-beta.6"
+    "xterm": "^5.0.0",
+    "xterm-addon-fit": "^0.6.0",
+    "xterm-addon-web-links": "^0.7.0"
   },
   "scripts": {
     "lint": "tsc --noEmit",