Update dependencies including map abstraction and multi-types in kin-openapi

[dependabot]

Update dependencies.
This PR uses the latest version of kin-openapi which changed schema/type from a single string to an array.
After this PR oasdiff will support schema/type as follows:

• Specs with multiple types are allowed as input
• Diff fully supports multiple types
• Breaking-changes, changelog and "flatten allOf" are backward compatible, meaning that they generate the same output for schemas with a single type
• Breaking-changes, changelog and "flatten allOf" are not yet tested for schemas with multiple types (tracked by Support breaking-changes and changelog for schemas with multiple types #534 and Support "flatten allOf" for schemas with multiple types #535)

[codecov]

Codecov Report

Attention: Patch coverage is 90.07092% with 14 lines in your changes are missing coverage. Please review.

Project coverage is 83.69%. Comparing base (6859bc7) to head (20b0d20).

Files	Patch %	Lines
checker/check_request_parameters_type_changed.go	86.36%	6 Missing and 3 partials ⚠️
checker/check_response_property_type_changed.go	85.71%	2 Missing and 1 partial ⚠️
utils/string_list.go	75.00%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #526      +/-   ##
==========================================
+ Coverage   83.67%   83.69%   +0.02%     
==========================================
  Files         226      227       +1     
  Lines       13083    13121      +38     
==========================================
+ Hits        10947    10982      +35     
- Misses       1718     1721       +3     
  Partials      418      418              

Flag	Coverage Δ
unittests	83.69% <90.07%> (+0.02%)	⬆️

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