chore(main): release google-ads-ad_manager 3.1.0 (#32904)

* chore(main): release google-ads-ad_manager 3.1.0

* 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: Yoshi Automation Bot <yoshi-automation@google.com>

Author: release-please[bot]

.release-please-manifest.json

@@ -1,5 +1,5 @@
 {
-  "google-ads-ad_manager": "3.0.0",
+  "google-ads-ad_manager": "3.1.0",
   "google-ads-ad_manager+FILLER": "0.0.0",
   "google-ads-ad_manager-v1": "3.1.0",
   "google-ads-ad_manager-v1+FILLER": "0.0.0",

google-ads-ad_manager/CHANGELOG.md

@@ -1,5 +1,11 @@
 # Changelog
 
+### 3.1.0 (2026-03-19)
+
+#### Features
+
+* Upgrade dependencies for Ruby v4.0 and drop Ruby v3.1 support
+
 ### 3.0.0 (2025-12-17)
 
 ### ⚠ BREAKING CHANGES

google-ads-ad_manager/lib/google/ads/ad_manager/version.rb

@@ -20,7 +20,7 @@
 module Google
   module Ads
     module AdManager
-      VERSION = "3.0.0"
+      VERSION = "3.1.0"
     end
   end
 end