utils/github: API.paginate_rest handles extra query params

- Functionally it doesn't matter that the URL will have an `&` at the
  end if `additional_query_params` is `nil`, because it doesn't affect
  the URL at all.

Library/Homebrew/utils/github.rb

@@ -704,7 +704,7 @@ module GitHub # rubocop:disable Metrics/ModuleLength
     return if Homebrew::EnvConfig.no_github_api?
 
     commits = 0
-    API.paginate_rest("#{API_URL}/repos/#{nwo}/commits", query: "&author=#{user}") do |result|
+    API.paginate_rest("#{API_URL}/repos/#{nwo}/commits", additional_query_params: "author=#{user}") do |result|
       commits += result.length
     end
     commits

Library/Homebrew/utils/github/api.rb

@@ -253,9 +253,9 @@ module GitHub
       end
     end
 
-    def paginate_rest(url, query: nil, per_page: 100)
+    def paginate_rest(url, additional_query_params: nil, per_page: 100)
       (1..API_MAX_PAGES).each do |page|
-        result = API.open_rest("#{url}?per_page=#{per_page}&page=#{page}#{query}")
+        result = API.open_rest("#{url}?per_page=#{per_page}&page=#{page}&#{additional_query_params}")
         yield(result, page)
       end
     end