chore(main): release google-shopping-merchant-promotions-v1 0.3.0 (#32833)

* chore(main): release google-shopping-merchant-promotions-v1 0.3.0

* 🦉 Updates from OwlBot post-processor

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

* chore: combine duplicate Ruby 4.0 release notes

---------

Co-authored-by: release-please[bot] <55107282+release-please[bot]@users.noreply.github.com>
Co-authored-by: Owl Bot <gcf-owl-bot[bot]@users.noreply.github.com>
Co-authored-by: Yoshi Automation Bot <yoshi-automation@google.com>

Author: 3 people

.release-please-manifest.json

@@ -1017,7 +1017,7 @@
   "google-shopping-merchant-products-v1beta+FILLER": "0.0.0",
   "google-shopping-merchant-promotions": "0.3.0",
   "google-shopping-merchant-promotions+FILLER": "0.0.0",
-  "google-shopping-merchant-promotions-v1": "0.2.1",
+  "google-shopping-merchant-promotions-v1": "0.3.0",
   "google-shopping-merchant-promotions-v1+FILLER": "0.0.0",
   "google-shopping-merchant-promotions-v1beta": "0.6.0",
   "google-shopping-merchant-promotions-v1beta+FILLER": "0.0.0",

google-shopping-merchant-promotions-v1/CHANGELOG.md

@@ -1,5 +1,12 @@
 # Changelog
 
+### 0.3.0 (2026-03-31)
+
+#### Features
+
+* Upgrade dependencies for Ruby v4.0 and drop Ruby v3.1 support
+* upgrade protobuf from v25.7 to v31.0 ([#32822](https://github.com/googleapis/google-cloud-ruby/issues/32822)) 
+
 ### 0.2.1 (2025-10-27)
 
 #### Documentation

google-shopping-merchant-promotions-v1/lib/google/shopping/merchant/promotions/v1/version.rb

@@ -22,7 +22,7 @@ module Shopping
     module Merchant
       module Promotions
         module V1
-          VERSION = "0.2.1"
+          VERSION = "0.3.0"
         end
       end
     end

google-shopping-merchant-promotions-v1/snippets/snippet_metadata_google.shopping.merchant.promotions.v1.json

@@ -1,7 +1,7 @@
 {
   "client_library": {
     "name": "google-shopping-merchant-promotions-v1",
-    "version": "0.2.1",
+    "version": "0.3.0",
     "language": "RUBY",
     "apis": [
       {