Update xterm.js to 6.1.0-beta.220 (#317936)

* Update xterm.js to 6.1.0-beta.220

* Stop the weirdness with cpu-features on package-lock.json

Author: anthonykim1

package-lock.json

@@ -120,16 +120,16 @@
     "@vscode/windows-mutex": "^0.5.0",
     "@vscode/windows-process-tree": "^0.7.0",
     "@vscode/windows-registry": "^1.2.0",
-    "@xterm/addon-clipboard": "^0.3.0-beta.213",
-    "@xterm/addon-image": "^0.10.0-beta.213",
-    "@xterm/addon-ligatures": "^0.11.0-beta.213",
-    "@xterm/addon-progress": "^0.3.0-beta.213",
-    "@xterm/addon-search": "^0.17.0-beta.213",
-    "@xterm/addon-serialize": "^0.15.0-beta.213",
-    "@xterm/addon-unicode11": "^0.10.0-beta.213",
-    "@xterm/addon-webgl": "^0.20.0-beta.212",
-    "@xterm/headless": "^6.1.0-beta.213",
-    "@xterm/xterm": "^6.1.0-beta.213",
+    "@xterm/addon-clipboard": "^0.3.0-beta.220",
+    "@xterm/addon-image": "^0.10.0-beta.220",
+    "@xterm/addon-ligatures": "^0.11.0-beta.220",
+    "@xterm/addon-progress": "^0.3.0-beta.220",
+    "@xterm/addon-search": "^0.17.0-beta.220",
+    "@xterm/addon-serialize": "^0.15.0-beta.220",
+    "@xterm/addon-unicode11": "^0.10.0-beta.220",
+    "@xterm/addon-webgl": "^0.20.0-beta.219",
+    "@xterm/headless": "^6.1.0-beta.220",
+    "@xterm/xterm": "^6.1.0-beta.220",
     "chrome-remote-interface": "^0.33.0",
     "http-proxy-agent": "^7.0.0",
     "https-proxy-agent": "^7.0.2",