pumbed vscode engine version to 1.48.0

Author: Arvid Paeglit

package.json

@@ -12,7 +12,7 @@
     "url": "https://github.com/DeepCodeAI/vscode-extension.git"
   },
   "engines": {
-    "vscode": "^1.46.0"
+    "vscode": "^1.48.0"
   },
   "galleryBanner": {
     "color": "#283e55",