bump version to 1.4.0

Author: yosida95

pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "jwt"
-version = "1.3.1"
+version = "1.4.0"
 description = "JSON Web Token library for Python 3."
 readme = "README.rst"