dev-cmd/contributions: Avoid the /users/#{user}/events API call

- This is wasteful when we can just catch the `ValidationFailedError`
  from the GitHub API from the search query.

Library/Homebrew/dev-cmd/contributions.rb

@@ -207,9 +207,8 @@ module Homebrew
 
   sig { params(repo_full_name: String, person: String, args: Homebrew::CLI::Args).returns(Integer) }
   def count_reviews(repo_full_name, person, args)
-    # Users who have made their contributions private are not searchable to determine counts.
-    return 0 if GitHub::API.open_rest("https://api.github.com/users/#{person}/events").empty?
-
     GitHub.count_issues("", is: "pr", repo: repo_full_name, reviewed_by: person, review: "approved", args: args)
+  rescue GitHub::API::ValidationFailedError
+    0 # Users who have made their contributions private are not searchable to determine counts.
   end
 end