chore(deps): update dependency typescript to v4

[skip ci]

Author: renovate-bot

package-lock.json

@@ -62,7 +62,7 @@
     "sinon": "9.0.3",
     "stream-buffers": "3.0.2",
     "tempy": "0.6.0",
-    "typescript": "3.9.7"
+    "typescript": "4.0.2"
   },
   "peerDependencies": {
     "semantic-release": ">=11.0.0 <18.0.0"