Fix two security issues

[YusukeJustinNakajima]

Description

Fixed below functions

• openapi.py
  • Fix yaml.load function argument to prevent arbitrary code execution
• json.py
  • Added character length limitation to fix ReDoS issue

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Refactor (does not change functionality, e.g. code style improvements, linting)
• Documentation update

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce. Please also list any relevant details for your test configuration

Please delete options that are not relevant.

• Unit Test
• Test Script (please provide)

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules
• I have checked my code and corrected any misspellings

Maintainer Checklist

• closes #xxxx (Replace xxxx with the GitHub issue number)
• Made sure Checks passed

[YusukeJustinNakajima]

@deshraj
I have fixed the security issue that I communicated to you via email. It would be very helpful if you could give priority to this issue. Also, although I have indicated that it is a "Refactor" this time, it would be better if you could make it clear that it is a security issue.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (295cd3f) 57.82% compared to head (3e908a0) 56.06%.
Report is 21 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1122      +/-   ##
==========================================
- Coverage   57.82%   56.06%   -1.77%     
==========================================
  Files         131      134       +3     
  Lines        5141     5372     +231     
==========================================
+ Hits         2973     3012      +39     
- Misses       2168     2360     +192     

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