Bump json from 1.6.1 to 1.6.8

[dependabot]

Bumps json from 1.6.1 to 1.6.8.

Changelog

Sourced from json's changelog.

2013-02-04 (1.6.8)

• Security fix for JSON create_additions default value. It should not be
  possible to create additions unless
  explicitely requested by setting the create_additions argument to true or
  using the JSON.load/dump interface.
  2012-04-27 (1.6.7)
• Fix possible crash when trying to parse nil value.
  2012-02-11 (1.6.6)
• Propagate src encoding to values made from it (fixes 1.9 mode converting
  everything to ascii-8bit; harmless for 1.8 mode too) (Thomas E. Enebo
  tom.enebo@gmail.com), should fix
  https://github.com/flori/json/issues#issue/119.
• Fix https://github.com/flori/json/issues#issue/124 Thx to Jason Hutchens.
• Fix https://github.com/flori/json/issues#issue/117
  2012-01-15 (1.6.5)
• Vit Ondruch v.ondruch@tiscali.cz reported a bug that shows up when using
  optimisation under GCC 4.7. Thx to him, Bohuslav Kabrda
  bkabrda@redhat.com and Yui NARUSE naruse@airemix.jp for debugging and
  developing a patch fix.
  2011-12-24 (1.6.4)
• Patches that improve speed on JRuby contributed by Charles Oliver Nutter
  headius@headius.com.
• Support object_class/array_class with duck typed hash/array.
  2011-12-01 (1.6.3)
• Let JSON.load('') return nil as well to make mysql text columns (default to
  '') work better for serialization.
  2011-11-21 (1.6.2)
• Add support for OpenStruct and BigDecimal.
• Fix bug when parsing nil in quirks_mode.
• Make JSON.dump and JSON.load methods better cooperate with Rails' serialize
  method. Just use: serialize :value, JSON
• Fix bug with time serialization concerning nanoseconds. Thanks for the
  patch go to Josh Partlow (jpartlow@github).
• Improve parsing speed for JSON numbers (integers and floats) in a similar way to
  what Evan Phoenix evan@phx.io suggested in:
  flori/json#103

Commits

• 3ce359b Security fix for create_additions problem 1.6.8
• 93b31b8 Merge branch 'master' of github.com:/flori/json
• 1b449c7 new version 1.6.7
• 7f64f21 Throw exception unless source is a string
• 7c6e8cd Rename test names according to file
• 3c1e226 new rubygems
• c6801b6 Add implementation for a light object
• f7ed2c6 Add implementation for a light object
• 0f0f08a change the CHANGES
• fc740f5 Add a comment mentioning some limitiation
• Additional commits viewable in compare view

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[dependabot]

Superseded by #9.