Updates Playwright to version 1.49.1 (#930)

This commit updates Playwright to the above version.

This change is not only for maintenance but also needed since the
previous version (1.40.1) fails to install on the latest version of
Ubuntu, which our GitHub Actions runners are using.

Author: haukesomm

headless-demo/package-lock.json

@@ -1,5 +1,5 @@
 {
   "devDependencies": {
-    "@playwright/test": "^1.40.1"
+    "@playwright/test": "^1.49.1"
   }
 }