Bump electron from 3.1.13 to 7.2.4 in /Tools/WinMLDashboard

Bumps [electron](https://github.com/electron/electron) from 3.1.13 to 7.2.4.
- [Release notes](https://github.com/electron/electron/releases)
- [Changelog](https://github.com/electron/electron/blob/master/docs/breaking-changes.md)
- [Commits](electron/electron@v3.1.13...v7.2.4)

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

Author: dependabot[bot]

Tools/WinMLDashboard/package.json

@@ -52,7 +52,7 @@
     "babel-minify": "^0.5.1",
     "chai": "^4.2.0",
     "chai-as-promised": "^7.1.1",
-    "electron": "^3.0.11",
+    "electron": "^7.2.4",
     "electron-winstaller": "^4.0.0",
     "fs-extra": "^8.1.0",
     "md5": "^2.2.1",