Update dependency @cucumber/html-formatter to v21.9.0 (#17)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

package-lock.json

@@ -28,7 +28,7 @@
     "@cucumber/ci-environment": "10.0.1",
     "@cucumber/cucumber-expressions": "18.0.1",
     "@cucumber/gherkin": "30.0.4",
-    "@cucumber/html-formatter": "21.8.0",
+    "@cucumber/html-formatter": "21.9.0",
     "@cucumber/messages": "27.2.0",
     "@cucumber/tag-expressions": "6.1.2",
     "globby": "^14.1.0",