bump nokogiri in case of security vulnerability

[dczulada]

Pull requests into cqm-parsers require the following. Submitter and reviewer should ✅ when done. For items that are not-applicable, note it's not-applicable ("N/A") and ✅.

Submitter:

• This pull request describes why these changes were made.
• Internal ticket for this PR:
• Internal ticket links to this PR
• Code diff has been done and been reviewed
• Tests are included and test edge cases
• Tests have been run locally and pass

Reviewer 1:

Name:

• Code is maintainable and reusable, reuses existing code and infrastructure where appropriate, and accomplishes the task’s purpose
• The tests appropriately test the new code, including edge cases
• You have tried to break the code

Reviewer 2:

Name:

• Code is maintainable and reusable, reuses existing code and infrastructure where appropriate, and accomplishes the task’s purpose
• The tests appropriately test the new code, including edge cases
• You have tried to break the code

[codecov-commenter]

Codecov Report

Merging #159 (149110c) into master (fd4d124) will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #159      +/-   ##
==========================================
+ Coverage   82.40%   82.42%   +0.01%     
==========================================
  Files          69       69              
  Lines        4320     4318       -2     
==========================================
- Hits         3560     3559       -1     
+ Misses        760      759       -1     

Impacted Files	Coverage Δ
lib/hqmf-parser/2.0/population_criteria.rb	93.44% <100.00%> (ø)
...rser/cql/document_helpers/doc_population_helper.rb	98.86% <100.00%> (ø)
lib/hqmf-parser/2.0/document.rb	90.76% <0.00%> (-0.77%)	⬇️
lib/util/vsac_api.rb	98.07% <0.00%> (ø)
lib/hqmf-parser/2.0/types.rb	83.82% <0.00%> (ø)
lib/hqmf-parser/1.0/attribute.rb	100.00% <0.00%> (ø)
lib/hqmf-parser/1.0/data_criteria.rb	97.91% <0.00%> (ø)
lib/hqmf-parser/2.0/data_criteria.rb	81.69% <0.00%> (ø)
lib/measure-loader/mat_measure_files.rb	95.34% <0.00%> (ø)
lib/hqmf-parser/2.0/field_value_helper.rb	88.79% <0.00%> (ø)
... and 8 more

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