fix(deps): update dependency @wdio/local-runner to ^9.21.0 (#381)

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

Author: renovate[bot]

package-lock.json

@@ -41,7 +41,7 @@
     "@serenity-js/serenity-bdd": "^3.36.2",
     "@serenity-js/web": "^3.36.2",
     "@serenity-js/webdriverio": "^3.36.2",
-    "@wdio/local-runner": "^9.20.1",
+    "@wdio/local-runner": "^9.21.0",
     "@wdio/spec-reporter": "^9.20.0",
     "jasmine": "^5.12.0"
   },