rake test fails with ruby3.2.0 preview3 and onwards

[mtasaka]

With sprockets git head ( 1276b43 ), $ bundle exec rake fails with ruby3.2.0preview3 and onwards like:

$ bundle exec rake
Run options: --seed 36636

# Running:

........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................S.....................................F.........................................................................................S................S............S..................................................................................S......................S.S.............................................................................................................................................

Finished in 42.726871s, 21.3449 runs/s, 95.7945 assertions/s.

  1) Failure:
TestURIUtils#test_split_file_uri [/builddir/build/GIT/sprockets/test/test_uri_utils.rb:42]:
--- expected
+++ actual
@@ -1 +1 @@
-["file", nil, "/etc/fstab", nil]
+["file", "", "/etc/fstab", nil]


912 runs, 4093 assertions, 1 failures, 0 errors, 7 skips

This is because of ruby/ruby@dd5118f : with ruby 3.2.0, URI.split sets empty string for host instead of nil.

[mtasaka]

Actually this is fixed by #771, especially 39490de