fix: demos/electron/package.json to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JS-ELECTRON-8302899
- https://snyk.io/vuln/SNYK-JS-ELECTRON-8302889
- https://snyk.io/vuln/SNYK-JS-ELECTRON-8302877
- https://snyk.io/vuln/SNYK-JS-ELECTRON-8302881
- https://snyk.io/vuln/SNYK-JS-ELECTRON-8302883
- https://snyk.io/vuln/SNYK-JS-ELECTRON-8302885
- https://snyk.io/vuln/SNYK-JS-ELECTRON-8302887
- https://snyk.io/vuln/SNYK-JS-ELECTRON-8302893
- https://snyk.io/vuln/SNYK-JS-ELECTRON-8302895
- https://snyk.io/vuln/SNYK-JS-ELECTRON-8302891
- https://snyk.io/vuln/SNYK-JS-ELECTRON-8230426
- https://snyk.io/vuln/SNYK-JS-ELECTRON-8302879
- https://snyk.io/vuln/SNYK-JS-ELECTRON-8302897

demos/electron/package.json

@@ -5,7 +5,7 @@
 	"main": "main.js",
 	"dependencies": {
 		"xlsx": "*",
-		"electron": "^9.0.5"
+		"electron": "^31.7.2"
 	},
 	"scripts": {
 		"start": "electron ."