Bump json from 1.7.4 to 2.3.0 in /edx_specs

[dependabot]

Bumps json from 1.7.4 to 2.3.0.

Changelog

Sourced from json's changelog.

Changes

2019-02-21 (2.2.0)

• Adds support for 2.6 BigDecimal and ruby standard library Set datetype.

2017-04-18 (2.1.0)

• Allow passing of decimal_class option to specify a class as which to parse
  JSON float numbers.

2017-03-23 (2.0.4)

• Raise exception for incomplete unicode surrogates/character escape
  sequences. This problem was reported by Daniel Gollahon (dgollahon).
• Fix arbitrary heap exposure problem. This problem was reported by Ahmad
  Sherif (ahmadsherif).

2017-01-12 (2.0.3)

• Set required_ruby_version to 1.9
• Some small fixes

2016-07-26 (2.0.2)

• Specify required_ruby_version for json_pure.
• Fix issue #295 failure when parsing frozen strings.

2016-07-01 (2.0.1)

• Fix problem when requiring json_pure and Parser constant was defined top
  level.
• Add RB_GC_GUARD to avoid possible GC problem via Pete Johns.
• Store current_nesting on stack by Aaron Patterson.

2015-09-11 (2.0.0)

• Now complies to newest JSON RFC 7159.
• Implements compatibiliy to ruby 2.4 integer unification.
• Drops support for old rubies whose life has ended, that is rubies < 2.0.
  Also see https://www.ruby-lang.org/en/news/2014/07/01/eol-for-1-8-7-and-1-9-2/
• There were still some mentions of dual GPL licensing in the source, but JSON
  has just the Ruby license that itself includes an explicit dual-licensing
  clause that allows covered software to be distributed under the terms of
  the Simplified BSD License instead for all ruby versions >= 1.9.3. This is
  however a GPL compatible license according to the Free Software Foundation.
  I changed these mentions to be consistent with the Ruby license setting in
  the gemspec files which were already correct now.

2015-06-01 (1.8.3)

• Fix potential memory leak, thx to nobu.

2015-01-08 (1.8.2)

• Some performance improvements by Vipul A M [email protected].
• Fix by Jason R. Clark [email protected] to avoid mutation of
  JSON.dump_default_options.
• More tests by Michael Mac-Vicar [email protected] and fixing
  space_before accessor in generator.

... (truncated)

Commits

• 92cf5c4 v2.3.0
• 579ae85 Add some more recent jruby
• acabfeb Make tests green on jruby
• c194360 Update travis config
• 49317c1 Ignore log files
• d84439f Merge pull request #391 from headius/prep_2.3.0
• 38f68d1 Bump versions for 2.3.0.
• 40524a9 Merge pull request #390 from flori/relax-test-unit
• 87379e6 relax test-unit version for old ruby
• 05de02f Merge branch 'zenspider-zenspider/ruby-2.7'
• Additional commits viewable in compare view

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[dependabot]

Superseded by #320.