ci(nightly): fix call to regress task (#591)

Nightly builds are failing because the 'test:nightly' task tries to call 'regress'. It should be 'test:regress'.

Signed-off-by: Derek Hower <134728312+dhower-qc@users.noreply.github.com>

Author: dhower-qc

Rakefile

@@ -447,7 +447,7 @@ namespace :test do
     Generally, this tries to build all artifacts
   DESC
   task :nightly do
-    Rake::Task["regress"].invoke
+    Rake::Task["test:regress"].invoke
     Rake::Task["portfolios"].invoke
     puts
     puts "Nightly regression test PASSED"