build(deps): bump electron-updater from 4.6.5 to 6.3.0

Bumps [electron-updater](https://github.com/electron-userland/electron-builder/tree/HEAD/packages/electron-updater) from 4.6.5 to 6.3.0.
- [Release notes](https://github.com/electron-userland/electron-builder/releases)
- [Changelog](https://github.com/electron-userland/electron-builder/blob/master/packages/electron-updater/CHANGELOG.md)
- [Commits](https://github.com/electron-userland/electron-builder/commits/electron-updater@6.3.0/packages/electron-updater)

---
updated-dependencies:
- dependency-name: electron-updater
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

client/package.json

@@ -45,7 +45,7 @@
     "auto-launch": "^5.0.5",
     "cordova-plugin-splashscreen": "^6.0.0",
     "cordova-plugin-statusbar": "^2.2.3",
-    "electron-updater": "^5.0.5",
+    "electron-updater": "^6.3.0",
     "fs-extra": "^11.2.0",
     "lit": "^2.2.2",
     "ShadowsocksConfig": "github:Jigsaw-Code/outline-shadowsocksconfig#v0.2.1",