chore: update version to v21.0.0

package-lock.json

@@ -1,6 +1,6 @@
 {
   "name": "electron-chromedriver",
-  "version": "20.0.0",
+  "version": "21.0.0",
   "lockfileVersion": 2,
   "requires": true,
   "packages": {
@@ -7137,4 +7137,4 @@
       "dev": true
     }
   }
-}
+}

package.json

@@ -1,6 +1,6 @@
 {
   "name": "electron-chromedriver",
-  "version": "20.0.0",
+  "version": "21.0.0",
   "description": "Electron ChromeDriver",
   "repository": "https://github.com/electron/chromedriver",
   "bin": {