chore(deps): update dependency @patternfly/patternfly-a11y to v5.2.1

Author: renovate[bot]

packages/react-docs/package.json

@@ -38,7 +38,7 @@
   },
   "devDependencies": {
     "@patternfly/documentation-framework": "^6.36.7",
-    "@patternfly/patternfly-a11y": "5.1.0"
+    "@patternfly/patternfly-a11y": "5.2.1"
   },
   "keywords": [
     "gatsby"