revert(json): revert `JSON` package update

[rustatian]

Reason for This PR

• Json package fails to unmarshal map[f64]f64

Description of Changes

• Revert JSON package.

License Acceptance

By submitting this pull request, I confirm that my contribution is made under the terms of the MIT license.

PR Checklist

[Author TODO: Meet these criteria.] [Reviewer TODO: Verify that these criteria are met. Request changes if not]

• [x] All commits in this PR are signed (git commit -s).
• [x] The reason for this PR is clearly provided (issue no. or explanation).
• [x] The description of changes is clear and encompassing.
• [x] Any required documentation changes (code and docs) are included in this PR.
• [x] Any user-facing changes are mentioned in CHANGELOG.md.
• [x] All added/changed functionality is tested.

[codecov[bot]]

Codecov Report

Merging #204 (cf32d1d) into master (597b5d8) will increase coverage by 0.06%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #204      +/-   ##
==========================================
+ Coverage   68.46%   68.53%   +0.06%     
==========================================
  Files         141      141              
  Lines       10824    10830       +6     
==========================================
+ Hits         7411     7422      +11     
+ Misses       2642     2638       -4     
+ Partials      771      770       -1     

Impacted Files	Coverage Δ
amqp/amqpjobs/item.go	73.28% <ø> (-1.37%)	:arrow_down:
beanstalk/beanstalkjobs/item.go	76.71% <ø> (+2.73%)	:arrow_up:
boltdb/boltjobs/item.go	45.32% <ø> (ø)
http/handler/request.go	79.76% <ø> (ø)
http/handler/response.go	47.61% <ø> (ø)
http/handler/uploads.go	80.88% <ø> (ø)
http/middleware/websockets/executor/executor.go	60.60% <ø> (ø)
http/middleware/websockets/plugin.go	63.59% <ø> (ø)
http/middleware/websockets/pool/workers_pool.go	64.86% <ø> (ø)
...iddleware/websockets/validator/access_validator.go	78.94% <ø> (ø)
... and 21 more

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