Update dependency typescript to v4.1.2 (#832)

Co-authored-by: Renovate Bot <bot@renovateapp.com>

Author: renovate[bot]

package-lock.json

@@ -19,7 +19,7 @@
         "lodash": "4.17.20",
         "minimatch": "3.0.4",
         "tslint": "6.1.3",
-        "typescript": "4.0.5"
+        "typescript": "4.1.2"
     },
     "devDependencies": {
         "@babel/core": "7.12.3",