Bump webmock from 3.19.1 to 3.20.0

[dependabot]

Bumps webmock from 3.19.1 to 3.20.0.

Changelog

Sourced from webmock's changelog.

3.20.0

• Optimised EmHttpRequestAdapter performance.

  Thanks to Ricardo Trindade

• Removed runtime dependency on base64.

  Thanks to Earlopain

• Typhoeus::Response objects constructed from stubbed responses now have all timing attributes set to 0.0.

  Thanks to James Brown

• Optimised WebMock::Util::Headers by removing redundant freeze invocations.

  Thanks to Kazuhiro NISHIYAMA

• The default stubbed response body, which is an empty String, is unfrozen.

• When building signatures of requests made by http.rb, the request body encoding is now preserved.

Commits

• 0e3c8fb Version 3.20.0
• 4489297 Preserving body encoding, when building request signature for executed HTTP.r...
• 39ef745 The default stubbed response body, which is an empty String, is utf-8 encoded.
• 25934a1 The default stubbed response body, which is an empty String, is unfrozen String.
• 6e78e31 Merge pull request #1047 from znz/patch-1
• 019aecc Merge pull request #1038 from instrumentl/typhoeus-timings
• 2cb15eb Added mutex_m to dev dependencies, for the httpclient specs to pass on Ruby 3.4
• fc13468 Merge pull request #1040 from mattbrictson/fix-async-specs
• 25584ff Updated configuration file for Github Actions CI
• 3c1799b Merge pull request #1046 from Earlopain/remove-base64-dep
• Additional commits viewable in compare view

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