Bump json from 2.3.0 to 2.5.1 in /pushpop

[dependabot-preview[bot]]

Bumps json from 2.3.0 to 2.5.1.

Changelog

Sourced from json's changelog.

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 Lafortune.
• Use frozen string for hash key. Pull request #420 by Marc-André Lafortune.
• Added :call-seq: to RDoc for some methods. Pull request #422 by Burdette Lamar.
• Small typo fix. Pull request #423 by Marc-André Lafortune.

Commits

• 9dc86f9 Bump version to 2.5.1
• 91f5fdf Merge pull request #459 from flori/backword-compatible
• 5910bef Added backword compatible for < json-2.5
• ea58503 Bump version to 2.5.0
• 9e73da3 Merge pull request #457 from flori/prepare-3.0
• 0c446fa Workaround for JRuby
• 951c7d1 Drop to tests with too old Ruby
• d1a341f Skip tests with JRuby platform
• dece237 Guard for Ruby 3.0
• 147cbfa Use 2.7 in Travis
• Additional commits viewable in compare view

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