Update webmock requirement from 1.21.0 to 3.9.1

[dependabot]

Updates the requirements on webmock to permit the latest version.

Changelog

Sourced from webmock's changelog.

3.9.1

Fixed support for passing URI objects as second argument of stub_request

Thanks to [Ryan Kerr](https://github.com/leboshi)

3.9.0

• Allow using a "callable" (like a proc) as URI pattern

  stub_request(:any, ->(uri) { true })
  

  Thanks to John Hawthorn

• Added stubbed IO on stubbed socket in Net::HTTP adapter.

  Thanks to Thilo Rusche

• When 'webmock/rspec' is required, reset WebMock after all after(:each/example) hooks

  Thanks to Andrew Stuntz

• Fixed net_connect_allowed? when invoked with no arguments, when there were any allowed URIs passed to disable_net_connect?.

  Thanks to Lucas Uyezu

• Fixed async-http adapter which caused Async::HTTP::Client or Async::HTTP::Internet to hang and never return a response.

  Thanks to (Bruno Sutic)[https://github.com/bruno-] and Samuel Williams

• Fixed warning when using async-http adapter

  Thanks to (Bruno Sutic)[https://github.com/bruno-]

• Dropped support for Ruby 2.3 - EOL date: 2019-03-31

• Dropped support for Ruby 2.4 - EOL date: 2020-03-31

• Handling matching of Addressable::Template patterns that have an ip address without port and patterns that have ip address and don’t have schema and path.

  Thanks to (Rafael França)[https://github.com/rafaelfranca] and (guppy0356)[https://github.com/guppy0356]

3.8.3

• Fixed problem introduced in version 3.4.2, which caused matching against Addressable::Template representing host part of the URI to raise an error.

  Thanks to Vesa Laakso

3.8.2

Commits

• 3f3184c Version 3.9.1
• c4f4f1f Merge pull request #904 from leboshi/master
• becfdfd Revert inversion of pattern check in URIPattern constructor.
• d9c4601 Version 3.9.0
• 75a3880 Version 3.9.0
• 72eee63 Handling matching of Addressable::Template patterns that have an ip address w...
• 0ad9a4e Removed RSpec warning
• 5e39c5b The default response headers for HTTP 1.0 requests returned by async-http hav...
• 28ccdb8 Added example on how to match requests using lambda.
• f011955 Dropped support for Ruby < 2.5. Previous Ruby versions are EOL
• Additional commits viewable in compare view

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[dependabot]

Superseded by #109.