electron app: switch back to electron 11.2 / chrome 87 to keep flash plugin support

bump version to 1.3.6

package.json

@@ -1,7 +1,7 @@
 {
   "name": "replaywebpage",
   "productName": "ReplayWeb.page",
-  "version": "1.3.6-alpha.0",
+  "version": "1.3.6",
   "description": "Serverless Web Archive Replay",
   "repository": "https://github.com/webrecorder/replayweb.page",
   "homepage": "https://replayweb.page/",
@@ -28,7 +28,7 @@
   "devDependencies": {
     "copy-webpack-plugin": "^6.3.0",
     "css-loader": "^3.5.3",
-    "electron": "^12.0.0-beta.14",
+    "electron": "^11.2.0",
     "electron-builder": "^22.7.0",
     "electron-notarize": "^1.0.0",
     "http-server": "^0.12.3",