chore(deps): update dependency @vscode/test-electron to v3

Author: renovate[bot]

vscode-testextension/package-lock.json

@@ -51,7 +51,7 @@
         "@types/mocha": "^10.0.2",
         "@types/node": "^24.0.0",
         "@types/vscode": "^1.82.0",
-        "@vscode/test-electron": "^2.3.4",
+        "@vscode/test-electron": "^3.0.0",
         "glob": "^11.1.0",
         "mocha": "^11.0.0",
         "source-map-support": "^0.5.21",