Update openapi-spec-validator to 0.5.7

[der-eismann]

This is causing a whole rat tail of transitive dependency issues for us. We can't install data-diff with Apache Airflow 2.6.3 constraints, because it requires dbt-artifacts-parser, which requires datamodel-code-generator, which requires openapi-spec-validator, however aforementioned constraints pin this project to 0.5.7. Would be great if this dependency could be loosened up a bit.
Analogue to #1343.

[codecov]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (e9b6edf) 100.00% compared to head (0006f53) 100.00%.
Report is 686 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff             @@
##            master     #1475     +/-   ##
===========================================
  Coverage   100.00%   100.00%             
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  Files           11        32     +21     
  Lines         1020      3565   +2545     
  Branches       201       837    +636     
===========================================
+ Hits          1020      3565   +2545     

Flag	Coverage Δ
unittests	99.63% <99.58%> (?)

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Files Changed	Coverage Δ
datamodel_code_generator/__init__.py	100.00% <100.00%> (ø)
datamodel_code_generator/__main__.py	100.00% <100.00%> (ø)
datamodel_code_generator/format.py	100.00% <100.00%> (ø)
datamodel_code_generator/http.py	100.00% <100.00%> (ø)
datamodel_code_generator/imports.py	100.00% <100.00%> (ø)
datamodel_code_generator/model/__init__.py	100.00% <100.00%> (ø)
datamodel_code_generator/model/base.py	100.00% <100.00%> (ø)
datamodel_code_generator/model/dataclass.py	100.00% <100.00%> (ø)
datamodel_code_generator/model/enum.py	100.00% <100.00%> (ø)
datamodel_code_generator/model/imports.py	100.00% <100.00%> (ø)
... and 22 more

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