Downgrade Electron from 26.2.1 to 25.8.1 to avoid renderer crash.

electron/electron#39775

Fixes #1327.

Signed-off-by: Anders Kaseorg <anders@zulip.com>

Author: andersk

package-lock.json

@@ -159,7 +159,7 @@
     "adm-zip": "^0.5.5",
     "auto-launch": "^5.0.5",
     "backoff": "^2.5.0",
-    "electron": "^26.2.1",
+    "electron": "^25.8.1",
     "electron-builder": "^24.6.4",
     "electron-log": "^4.3.5",
     "electron-updater": "^6.1.4",