Update functions-compat typescript vesrion

Author: hsubox76

packages-exp/functions-compat/package.json

@@ -20,7 +20,7 @@
     "rollup": "2.29.0",
     "@rollup/plugin-json": "4.1.0",
     "rollup-plugin-typescript2": "0.27.3",
-    "typescript": "4.0.2"
+    "typescript": "4.0.5"
   },
   "repository": {
     "directory": "packages-exp/functions-compat",