Update multi_json requirement from ~> 1.15.0 to ~> 1.18.0

[dependabot]

Updates the requirements on multi_json to permit the latest version.

Changelog

Sourced from multi_json's changelog.

1.18.0

• Fix conflict between JSON gem and ActiveSupport

1.17.0

• Revert minimum ruby version requirement

1.16.0

• Remove NSJSONSerialization
• Stop referencing JSON::PRETTY_STATE_PROTOTYPE
• Drop support for Ruby versions < 3.2
• Move repo from @​intridea to @sferik
• JsonCommon: force encoding to UTF-8, not binary
• Stop setting defaults in JsonCommon
• Make json_pure an alias of json_gem

1.15.0

• Improve detection of json_gem adapter

1.14.1

• Fix a warning in Ruby 2.7

1.14.0

• Support Oj 3.x gem

1.13.1

• Fix missing stdlib set dependency in oj adapter

1.13.0

• Make Oj adapter handle JSON::ParseError correctly

1.12.2

• Renew gem certificate

1.12.1

• Prevent memory leak in OptionsCache

1.12.0

• Introduce global options cache to improve peroformance

... (truncated)

Commits

• 97391cf Version 1.18.0
• df90a20 Update changelog for 1.18.0
• c0dfb79 Fix links in changelog
• 2708aca Update indent option spec for JSON.generate
• 2244b58 Use fetch(:load, :baz) instead of fetch(:load) { :baz }
• 19e4969 Block supersedes default value argument
• ab4ae2e Remove unused block argument
• 63bdc72 Add an empty line after module inclusion
• cbfc8c6 Version 1.17.0
• 198cb84 Update changelog for 1.17.0
• Additional commits viewable in compare view

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