Merge pull request #15577 from mleko/master

Remove @types/gulp-typescript dependency

Author: mhegazy

package.json

@@ -39,7 +39,6 @@
         "@types/gulp-help": "latest",
         "@types/gulp-newer": "latest",
         "@types/gulp-sourcemaps": "latest",
-        "@types/gulp-typescript": "latest",
         "@types/merge2": "latest",
         "@types/minimatch": "latest",
         "@types/minimist": "latest",