package: update flask-cors to version 3.0.9

* Updates `flask-cors` to version 3.0.9 to avoid a security issue in previous versions.
* Forces `pytest` version to be smaller than version 6.
* Changes `isort` call to match with the new version (5.x).
* Moves imports to avoid error during `isort` checks.

Co-Authored-by: Sébastien Délèze <sebastien.deleze@rero.ch>

Pipfile

@@ -37,6 +37,7 @@ safety = ">=1.8"
 wand = ">=0.5.0,<0.6.0"
 transifex-client = "*"
 python-dotenv = "*"
+flask-cors = ">3.0.8"
 
 [dev-packages]
 Flask-Debugtoolbar = ">=0.10.1"
@@ -47,7 +48,7 @@ isort = ">=4.3"
 mock = ">=2.0.0"
 marshmallow = ">=2.15.1,<3.0.0"
 pydocstyle = ">=2.0.0"
-pytest = ">=3.3.1"
+pytest = ">=4.6.4,<6.0.0"
 pytest-cov = ">=2.5.1"
 pytest-invenio = ">=1.2.1,<1.3.0"
 pytest-mock = ">=1.6.0"