fix(deps): update @playwright/test to 1.60.0 (#38144)

Backports only the `@playwright/test` bump (1.59.0 → 1.60.0) to
`release/v1.26`.

### Why

The `test-e2e` workflow's `make playwright` step downloads the browser,
then hangs indefinitely during zip extraction on Node 24.16.0 (the
version GitHub's `node-version: 24` resolves to). This is the upstream
Node regression https://github.com/nodejs/node/issues/63487, which
Playwright `<=1.59` is vulnerable to and `1.60.0` works around
(https://github.com/microsoft/playwright/issues/41000).

Since `make playwright` has no `timeout-minutes`, the hang burns a
runner until GitHub's 6h job cap, e.g.
https://github.com/go-gitea/gitea/actions/runs/27661523385/job/81806711998

`main` already ships `1.60.0`; this backports only that single
dependency, nothing else.

---
Assisted-by: claude-code:opus-4.8

package.json

@@ -78,7 +78,7 @@
   "devDependencies": {
     "@eslint-community/eslint-plugin-eslint-comments": "4.7.1",
     "@eslint/json": "1.2.0",
-    "@playwright/test": "1.59.0",
+    "@playwright/test": "1.60.0",
     "@stylistic/eslint-plugin": "5.10.0",
     "@stylistic/stylelint-plugin": "5.1.0",
     "@types/codemirror": "5.60.17",