reverted @types/vscode back to v1.42.0 for min required vscode v.

to match engines entry in package.json

Author: RandomFractals

package.json

@@ -226,7 +226,7 @@
     "@types/node": "^13.9.1",
     "@types/superagent": "^4.1.7",
     "@types/topojson-client": "3.0.0",
-    "@types/vscode": "^1.43.0",
+    "@types/vscode": "^1.42.0",
     "@types/xmldom": "0.1.29",
     "glob": "^7.1.6",
     "mocha": "^7.1.0",