Log Message:
py-openapi-schema-validator: updated to 0.2.3

0.2.3
readOnly and writeOnly on jsonschema4 fix

0.2.2
Validate oneOf, anyOf and allOf with discriminator (cherry-pick from 0.3.x)

0.2.1
Revert "make jsonschema4 compatible (DeprecationWarning fix)"
Drop python 3.6 support (cherry-pick from 0.3.x and part 2)
Limit jsonschema dependency

0.2.0
switch to poetry
drop python 2.7 and 3.5 support
make jsonschema4 compatible (DeprecationWarning fix)