Restore the original Poetry state after a Tox run by using the same Pydantic version spec

Author: hathawsh

tox.ini

@@ -21,7 +21,7 @@ labels = core
 allowlist_externals = poetry
 commands_pre =
   poetry install --only main --only test --no-root --all-extras
-  poetry add 'pydantic==*'
+  poetry add 'pydantic>=1.8'
 commands = poetry run pytest -vv tests
 
 [testenv:type_pydantic1]
@@ -35,7 +35,7 @@ commands = poetry run mypy openapi_pydantic tests
 allowlist_externals = poetry
 commands_pre =
   poetry install --no-root --all-extras
-  poetry add 'pydantic==*'
+  poetry add 'pydantic>=1.8'
 commands = poetry run mypy openapi_pydantic tests
 
 [testenv:format]