ci: bump Playwright to 1.60, debug browser installs

The 1.59.1 install hangs deterministically on ubuntu-latest after
downloading the Chrome for Testing archive; every bounded retry stalls
the same way. Track the latest release and emit pw:install debug
output so any future stall shows where it stops.

Author: dunglas

.github/workflows/ci.yml

@@ -114,6 +114,8 @@ jobs:
         if: steps.playwright-cache.outputs.cache-hit != 'true'
         working-directory: conformance-tests/
         timeout-minutes: 15
+        env:
+          DEBUG: pw:install
         # The CDN download can hang mid-install; bound each attempt and retry
         # instead of letting the step-level timeout kill the whole job.
         run: |

conformance-tests/package-lock.json

@@ -14,7 +14,7 @@
   "license": "AGPL-3.0-or-later",
   "type": "commonjs",
   "devDependencies": {
-    "@playwright/test": "^1.59.1",
+    "@playwright/test": "^1.60.0",
     "@types/node": "^25.6.2",
     "dotenv": "^17.4.2"
   }