Update dependency electron to v29 (#1557)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

playwright/e2e/launch/launch.spec.ts

@@ -17,6 +17,7 @@ limitations under the License.
 import { test, expect } from "../../element-desktop-test";
 
 test.describe("App launch", () => {
+    test.slow();
     test("should launch and render the welcome view successfully", async ({ page }) => {
         await page.locator("#matrixchat").waitFor();
         await page.locator(".mx_Welcome").waitFor();

playwright/element-desktop-test.ts

@@ -33,7 +33,7 @@ export const test = base.extend<{ app: ElectronApplication; tmpDir: string }>({
         const executablePath = process.env["ELEMENT_DESKTOP_EXECUTABLE"];
         if (!executablePath) {
             // Unpackaged mode testing
-            args.unshift("./lib/electron-main.js");
+            args.unshift(path.join(__dirname, "..", "lib", "electron-main.js"));
         }
 
         const app = await electron.launch({
@@ -42,6 +42,9 @@ export const test = base.extend<{ app: ElectronApplication; tmpDir: string }>({
             args,
         });
 
+        app.process().stdout.pipe(process.stdout);
+        app.process().stderr.pipe(process.stderr);
+
         await app.firstWindow();
         await use(app);
     },