Update sinatra requirement from ~> 2.0 to >= 2, < 4

[dependabot[bot]]

Updates the requirements on sinatra to permit the latest version.

Changelog

Sourced from sinatra's changelog.

2.2.1 / 2022-07-15

• Fix JRuby regression by using ruby2_keywords for delegation. #1750 by Patrik Ragnarsson

• Add JRuby to CI. #1755 by Karol Bucek

2.2.0 / 2022-02-15

• Breaking change: Add #select, #reject and #compact methods to Sinatra::IndifferentHash. If hash keys need to be converted to symbols, call #to_h to get a Hash instance first. #1711 by Olivier Bellone

• Handle EOFError raised by Rack and return Bad Request 400 status. #1743 by tamazon

• Minor refactors in base.rb. #1640 by ceclinux

• Add escaping to the static 404 page. #1645 by Chris Gavin

• Remove detect_rack_handler method. #1652 by ceclinux

• Respect content type set in superclass before filter. Fixes #1647 #1649 by Jordan Owens

• Revert "Use prepend instead of include for helpers. #1662 by namusyaka

• Fix usage of inherited Sinatra::Base classes keyword arguments. Fixes #1669 #1670 by Cadu Ribeiro

• Reduce RDoc generation time by not including every README. Fixes #1578 #1671 by Eloy Pérez

• Add support for per form csrf tokens. Fixes #1616 #1653 by Jordan Owens

• Update MAINTENANCE.md with the stable branch status. #1681 by Fredrik Rubensson

• Validate expanded path matches public_dir when serving static files. #1683 by cji-stripe

• Fix Delegator to pass keyword arguments for Ruby 3.0. #1684 by andrewtblake

• Fix use with keyword arguments for Ruby 3.0. #1701 by Robin Wallin

• Fix memory leaks for proc template. Fixes #1704 #1719 by Slevin

• Remove unnecessary test_files from the gemspec. #1712 by Masataka Pocke Kuwabara

• Docs: Spanish documentation: Update README.es.md with removal of Thin. #1630 by Espartaco Palma

• Docs: German documentation: Fixed typos in German README.md. #1648 by Juri

• Docs: Japanese documentation: Update README.ja.md with removal of Thin. #1629 by Ryuichi KAWAMATA

• Docs: English documentation: Various minor fixes to README.md. #1663 by Yanis Zafirópulos

• Docs: English documentation: Document when dump_errors is enabled. Fixes #1664 #1665 by Patrik Ragnarsson

... (truncated)

Commits

• e6a2420 Fix CI failures
• 04134fa Bump version to 2.2.1
• 286f425 TODOed! :yay:
• 2541062 Test: house-keeping - remove JRubyServer
• b7bb22c avoid threaded setup for test server
• ba2b263 CI: let's roll tests with JRuby
• d5b6532 CI: Use working-directory directive
• 0af1e1e Run tests for gems in different steps
• 3dd160b Use ruby2_keywords for delegation
• c4608c8 Bump version to 2.2.0
• Additional commits viewable in compare view

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