Version 5.0.0

Other changes

• Support Ruby 3.1 through 4.0, and drop Ruby 3.0.
• Refresh development dependencies for Ruby 4.0 compatibility.
• Bump activesupport to 7.2.3.1, sqlite3 to 2.9.5, concurrent-ruby to 1.3.7, and cgi to 0.3.7.

What's Changed

• ci: test against Ruby 4.0 by @eitoball in #160
• Release 5.0.0 by @eitoball in #172

Full Changelog: v4.9.0...v5.0.0