Bump plugin-pagenotfound from 2026.6.0 to 2026.6.1

Bumps [plugin-pagenotfound](https://github.com/Webperf-se/plugin-pagenotfound) from 2026.6.0 to 2026.6.1.
- [Release notes](https://github.com/Webperf-se/plugin-pagenotfound/releases)
- [Commits](Webperf-se/plugin-pagenotfound@2026.6.0...2026.6.1)

---
updated-dependencies:
- dependency-name: plugin-pagenotfound
  dependency-version: 2026.6.1
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

package.json

@@ -22,7 +22,7 @@
     "plugin-css": "2026.6.1",
     "plugin-html": "2026.6.0",
     "plugin-javascript": "2026.6.0",
-    "plugin-pagenotfound": "2026.6.0",
+    "plugin-pagenotfound": "2026.6.1",
     "plugin-standard-files": "2026.6.2",
     "plugin-accessibility-statement": "2026.6.0",
     "plugin-webperf-core": "2026.6.1"