Stop Rake from telling us every spec it's about to run.

As per
https://github.com/rspec/rspec-core/issues/266#issuecomment-1866898

lib/tasks/testing.rake

@@ -1,5 +1,9 @@
 require 'rake'
 begin
   require 'rspec/core/rake_task'
+  task(:spec).clear
+  RSpec::Core::RakeTask.new(:spec) do |t|
+    t.verbose = false
+  end
 rescue LoadError
 end