fix(deps): update webdriverio monorepo to ^9.21.0 (#1023)

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

Author: renovate[bot]

package-lock.json

@@ -41,12 +41,12 @@
     "@serenity-js/serenity-bdd": "^3.36.2",
     "@serenity-js/web": "^3.36.2",
     "@serenity-js/webdriverio": "^3.36.2",
-    "@wdio/cli": "^9.20.1",
+    "@wdio/cli": "^9.21.0",
     "@wdio/globals": "^9.17.0",
-    "@wdio/local-runner": "^9.20.1",
+    "@wdio/local-runner": "^9.21.0",
     "@wdio/spec-reporter": "^9.20.0",
     "mocha": "^11.7.5",
-    "webdriverio": "^9.20.1"
+    "webdriverio": "^9.21.0"
   },
   "devDependencies": {
     "@types/mocha": "^10.0.10",