Bump json from 1.6.5 to 1.8.6

[dependabot[bot]]

Bumps json from 1.6.5 to 1.8.6.

Changelog

Sourced from json's changelog.

Changes

2021-10-24 (2.6.1)

• Restore version.rb with 2.6.1

2021-10-14 (2.6.0)

• Use rb_enc_interned_str if available to reduce allocations in freeze: true mode. #451.
• Bump required_ruby_version to 2.3.
• Fix compatibility with GC.compact.
• Fix some compilation warnings. #469

2020-12-22 (2.5.1)

• Restore the compatibility for constants of JSON class.

2020-12-22 (2.5.0)

• Ready to Ractor-safe at Ruby 3.0.

2020-12-17 (2.4.1)

• Restore version.rb with 2.4.1

2020-12-15 (2.4.0)

• Implement a freeze: parser option #447
• Fix an issue with generate_pretty and empty objects in the Ruby and Java implementations #449
• Fix JSON.load_file doc #448
• Fix pure parser with unclosed arrays / objects #425
• bundle the LICENSE file in the gem #444
• Add an option to escape forward slash character #405
• RDoc for JSON #439 #446 #442 #434 #433 #430

2020-06-30 (2.3.1)

• Spelling and grammar fixes for comments. Pull request #191 by Josh Kline.
• Enhance generic JSON and #generate docs. Pull request #347 by Victor Shepelev.
• Add :nodoc: for GeneratorMethods. Pull request #349 by Victor Shepelev.
• Baseline changes to help (JRuby) development. Pull request #371 by Karol Bucek.
• Add metadata for rubygems.org. Pull request #379 by Alexandre ZANNI.
• Remove invalid JSON.generate description from JSON module rdoc. Pull request #384 by Jeremy Evans.
• Test with TruffleRuby in CI. Pull request #402 by Benoit Daloze.
• Rdoc enhancements. Pull request #413 by Burdette Lamar.
• Fixtures/ are not being tested... Pull request #416 by Marc-André

... (truncated)

Commits

• 7f4cfd8 Try to be compatible with ruby 1.8
• 4cf6c62 Update gemspecs
• 48c5e99 Stop testing on 1.8, it might work though
• 5d46fb9 Travis don't know how to build these rubies
• 7f05140 Fix conversion crash on 1.9
• 2bcacc1 Require ruby version 2.0 or better
• f8e2aa6 Reduce supported ruby versions
• b4eeed1 Test newer rubies
• c7a6e31 Use 2.3.1 for testing
• 953f474 Merge RUBY_INTEGER_UNIFICATION changes
• Additional commits viewable in compare view

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