fix: Allow LF or TAB in the middle of JSON detection

[richtera]

What kind of change does this PR introduce (bug fix, feature, docs update, ...)?

Allow JSON detection to work if there is a LF right before and after the end.

What is the current behaviour (you can also link to an open issue here)?

What is the new behaviour (if this is a feature change)?

Other information:

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 82.12%. Comparing base (945210a) to head (315fa54).

Files	Patch %	Lines
src/lib/getDataFromExternalSources.ts	0.00%	0 Missing and 1 partial ⚠️

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Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #391   +/-   ##
========================================
  Coverage    82.12%   82.12%           
========================================
  Files           19       19           
  Lines         1309     1309           
  Branches       302      302           
========================================
  Hits          1075     1075           
  Misses         128      128           
  Partials       106      106           

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[richtera]

@Hugoo This one is required first.