Rack::Server has removed in Rack 3.0 and the server will not start

[kojix2]

Hello.

Recently Rack::Server was removed from Rack. So in some cases, commands such as yard server -g do not work.
To fix this problem, you need to load a Gem called rackup and change Rack::Server to Rackup::Server.

See minimal code to fix: #1472

Steps to reproduce

yard server -g

Actual Output

<internal:/home/kojix2/.rbenv/versions/3.1.3/lib/ruby/3.1.0/rubygems/core_ext/kernel_require.rb>:160:in `require': cannot load such file -- rack/server (LoadError)
	from <internal:/home/kojix2/.rbenv/versions/3.1.3/lib/ruby/3.1.0/rubygems/core_ext/kernel_require.rb>:160:in `rescue in require'
	from <internal:/home/kojix2/.rbenv/versions/3.1.3/lib/ruby/3.1.0/rubygems/core_ext/kernel_require.rb>:149:in `require'
	from /home/kojix2/.rbenv/versions/3.1.3/lib/ruby/gems/3.1.0/gems/yard-0.9.28/lib/yard/server/rack_adapter.rb:63:in `start'
	from /home/kojix2/.rbenv/versions/3.1.3/lib/ruby/gems/3.1.0/gems/yard-0.9.28/lib/yard/cli/server.rb:51:in `run'
	from /home/kojix2/.rbenv/versions/3.1.3/lib/ruby/gems/3.1.0/gems/yard-0.9.28/lib/yard/cli/command.rb:14:in `run'
	from /home/kojix2/.rbenv/versions/3.1.3/lib/ruby/gems/3.1.0/gems/yard-0.9.28/lib/yard/cli/command_parser.rb:72:in `run'
	from /home/kojix2/.rbenv/versions/3.1.3/lib/ruby/gems/3.1.0/gems/yard-0.9.28/lib/yard/cli/command_parser.rb:54:in `run'
	from /home/kojix2/.rbenv/versions/3.1.3/lib/ruby/gems/3.1.0/gems/yard-0.9.28/bin/yard:13:in `<top (required)>'
	from /home/kojix2/.rbenv/versions/3.1.3/bin/yard:25:in `load'
	from /home/kojix2/.rbenv/versions/3.1.3/bin/yard:25:in `<main>'
<internal:/home/kojix2/.rbenv/versions/3.1.3/lib/ruby/3.1.0/rubygems/core_ext/kernel_require.rb>:85:in `require': cannot load such file -- rack/server (LoadError)
	from <internal:/home/kojix2/.rbenv/versions/3.1.3/lib/ruby/3.1.0/rubygems/core_ext/kernel_require.rb>:85:in `require'
	from /home/kojix2/.rbenv/versions/3.1.3/lib/ruby/gems/3.1.0/gems/yard-0.9.28/lib/yard/server/rack_adapter.rb:63:in `start'
	from /home/kojix2/.rbenv/versions/3.1.3/lib/ruby/gems/3.1.0/gems/yard-0.9.28/lib/yard/cli/server.rb:51:in `run'
	from /home/kojix2/.rbenv/versions/3.1.3/lib/ruby/gems/3.1.0/gems/yard-0.9.28/lib/yard/cli/command.rb:14:in `run'
	from /home/kojix2/.rbenv/versions/3.1.3/lib/ruby/gems/3.1.0/gems/yard-0.9.28/lib/yard/cli/command_parser.rb:72:in `run'
	from /home/kojix2/.rbenv/versions/3.1.3/lib/ruby/gems/3.1.0/gems/yard-0.9.28/lib/yard/cli/command_parser.rb:54:in `run'
	from /home/kojix2/.rbenv/versions/3.1.3/lib/ruby/gems/3.1.0/gems/yard-0.9.28/bin/yard:13:in `<top (required)>'
	from /home/kojix2/.rbenv/versions/3.1.3/bin/yard:25:in `load'
	from /home/kojix2/.rbenv/versions/3.1.3/bin/yard:25:in `<main>'

Expected Output

>> YARD 0.9.28 documentation server at http://localhost:8808
Rack::Handler is deprecated and replaced by Rackup::Handler
Puma starting in single mode...
* Puma version: 6.0.2 (ruby 3.1.3-p185) ("Sunflower")
*  Min threads: 0
*  Max threads: 5
*  Environment: development
*          PID: 92155
* Listening on http://0.0.0.0:8808
Use Ctrl-C to stop

Environment details:

• OS: Ubuntu 22.04
• Ruby version ruby 3.1.3p185 (2022-11-24 revision 1a6b16756e) [x86_64-linux]
• YARD version (yard -v): yard 0.9.28

I have read the Contributing Guide.

[lsegal]

Fixed in 54f1771