fix(deps): pin dependency tslib to 2.1.0 (#89)

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

Author: renovate[bot]

projects/rx-form-mapper/package.json

@@ -21,7 +21,7 @@
     "typescript-library"
   ],
   "dependencies": {
-    "tslib": "^2.0.0"
+    "tslib": "2.1.0"
   },
   "peerDependencies": {
     "@angular/common": "^7.1.0 || ^8.0.0 || ^11.0.0",