Bump sitespeed.io from 38.4.1 to 38.6.0

Bumps [sitespeed.io](https://github.com/sitespeedio/sitespeed.io) from 38.4.1 to 38.6.0.
- [Release notes](https://github.com/sitespeedio/sitespeed.io/releases)
- [Changelog](https://github.com/sitespeedio/sitespeed.io/blob/main/CHANGELOG.md)
- [Commits](sitespeedio/sitespeed.io@v38.4.1...v38.6.0)

---
updated-dependencies:
- dependency-name: sitespeed.io
  dependency-version: 38.6.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

package.json

@@ -18,7 +18,7 @@
     "@sitespeed.io/plugin": "1.0.0",
     "@sitespeed.io/plugin-lighthouse": "13.0.0",
     "pa11y": "9.0.1",
-    "sitespeed.io": "38.4.1",
+    "sitespeed.io": "38.6.0",
     "plugin-css": "2025.10.0",
     "plugin-html": "2025.10.0",
     "plugin-javascript": "2025.10.0",