dbus-vis: bump Electron version from 11.5.0 to 18.2.4

`npm` reports a vulnerability with Electron 11.5.0, bumping to the new
version fixes the vulnerability.

Signed-off-by: Sui Chen <suichen@google.com>
Change-Id: I456a8f4f4aeb4d61ddc435341dd94616267e5a47
diff --git a/dbus-vis/package.json b/dbus-vis/package.json
index fab7bbc..5abe160 100644
--- a/dbus-vis/package.json
+++ b/dbus-vis/package.json
@@ -15,7 +15,7 @@
     "IPMI"
   ],
   "devDependencies": {
-    "electron": "^11.5.0"
+    "electron": "^18.2.4"
   },
   "dependencies": {
     "electron-dialog": "^2.0.0",