feat: upgrade protobuf from v25.7 to v31.0 (#32822)

* feat: upgrade protobuf from v25.7 to v31.0

PiperOrigin-RevId: 881595129

Source-Link: googleapis/googleapis@d90d23f

Source-Link: googleapis/googleapis-gen@f1a9443
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* 🦉 Updates from OwlBot post-processor

See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md

---------

Co-authored-by: Owl Bot <gcf-owl-bot[bot]@users.noreply.github.com>

Author: gcf-owl-bot[bot]

google-shopping-merchant-order_tracking-v1beta/lib/google/shopping/merchant/ordertracking/v1beta/order_tracking_signals_pb.rb

@@ -1,7 +1,7 @@
 {
   "client_library": {
     "name": "google-shopping-merchant-order_tracking-v1beta",
-    "version": "0.2.0",
+    "version": "0.2.1",
     "language": "RUBY",
     "apis": [
       {