feat: Automated regeneration of Eventarc client (googleapis#12164)

Auto-created at 2024-09-19 13:10:16 +0000 using the toys pull request generator.

Author: yoshi-code-bot

clients/eventarc/README.md

@@ -11,7 +11,7 @@ Install this package from [Hex](https://hex.pm) by adding
 
 ```elixir
 def deps do
-  [{:google_api_eventarc, "~> 0.14"}]
+  [{:google_api_eventarc, "~> 0.15"}]
 end
 ```