Fix Ruby 2.7 deprecation warnings in app/controllers/import

In Ruby 3.0, positional arguments and keyword arguments will be
separated. Ruby 2.7 will warn for behaviors that will change in Ruby
3.0. In most cases, you can avoid the incompatibility by adding the
double splat operator. It explicitly specifies passing keyword arguments
instead of a Hash object.

Part of https://gitlab.com/gitlab-org/gitlab/-/issues/257438

app/controllers/import/fogbugz_controller.rb

@@ -136,7 +136,7 @@ class Import::FogbugzController < Import::BaseController
   def verify_blocked_uri
     Gitlab::UrlBlocker.validate!(
       params[:uri],
-      {
+      **{
         allow_localhost: allow_local_requests?,
         allow_local_network: allow_local_requests?,
         schemes: %w(http https)

app/controllers/import/github_controller.rb

@@ -108,7 +108,7 @@ class Import::GithubController < Import::BaseController
     @client ||= if Feature.enabled?(:remove_legacy_github_client)
                   Gitlab::GithubImport::Client.new(session[access_token_key])
                 else
-                  Gitlab::LegacyGithubImport::Client.new(session[access_token_key], client_options)
+                  Gitlab::LegacyGithubImport::Client.new(session[access_token_key], **client_options)
                 end
   end