Update composer.json keywords to v3.2

Replaces 'v3.1' with 'v3.2' in the keywords array across multiple composer.json files to reflect the new version. This ensures consistency and accurate version tagging for all related packages.

Co-Authored-By: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-Authored-By: huangdijia <8337659+huangdijia@users.noreply.github.com>

Author: huangdijia

composer.json

@@ -5,7 +5,7 @@
     "type": "library",
     "keywords": [
         "hyperf",
-        "v3.1",
+        "v3.2",
         "mailer"
     ],
     "authors": [