Bump plugin-css from 2026.6.1 to 2026.6.2

Bumps [plugin-css](https://github.com/Webperf-se/plugin-css) from 2026.6.1 to 2026.6.2.
- [Release notes](https://github.com/Webperf-se/plugin-css/releases)
- [Commits](Webperf-se/plugin-css@2026.6.1...2026.6.2)

---
updated-dependencies:
- dependency-name: plugin-css
  dependency-version: 2026.6.2
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

package.json

@@ -19,7 +19,7 @@
     "@sitespeed.io/plugin-lighthouse": "13.0.1",
     "pa11y": "9.1.1",
     "sitespeed.io": "41.3.3",
-    "plugin-css": "2026.6.1",
+    "plugin-css": "2026.6.2",
     "plugin-html": "2026.6.0",
     "plugin-javascript": "2026.6.0",
     "plugin-pagenotfound": "2026.6.0",