📌 Pinned dependencies in Pipfile

While running 'pipenv install --dev', this updated the lockfile.

Author: sergei-maertens

Pipfile

@@ -11,7 +11,7 @@ pytest = ">=6.2.2"
 
 [packages]
 prance = ">=0.20.2"
-openapi-spec-validator = ">=0.2.9"
+openapi-spec-validator = ">=0.2.9,<0.5.0"
 
 [requires]
 python_version = "3.9"