I have just noticed, that rubygem-actionpack, rubygem-rack,
rubygem-racktest are broken with latest Ruby. It seems the issue is on
"cgi" gem side. E.g. these are the ActionPack related tickets:
https://koschei.fedoraproject.org/package/rubygem-actionpack?collection=f38
https://github.com/rails/rails/issues/46578
https://github.com/rails/rails/pull/46595
And this is the fix in the cgi gem:
https://github.com/ruby/cgi/pull/29
Unfortunately, current recommendation is following what Rails did, i.e.
"update the cgi" gem. This is was already fixed also in Ruby, but it
does not seems upstream considers this important enough to cut a new
release :/
https://github.com/ruby/ruby/pull/6784
I'll apply the patch in Ruby shortly. Sorry for the breakage.
Vít