Revert "fix: Try to bring back notarization"

This reverts commit 65bf35d.

Notarization failed in GHA.  Probably due to lapsed agreement.

Author: ribose-jeffreylau

package.json

@@ -53,7 +53,6 @@
     "productName": "ITU OB Editor",
     "appId": "org.ituob.editor",
     "afterPack": "./scripts/after-pack.js",
-    "afterSign": "electron-builder-notarize",
     "asarUnpack": [
       "**/*.node",
       "node_modules/source-map/**/*",