Refactor warning handling for blackduck import (DefectDojo#13229)

* Refactor warning handling for blackduck import

Correcting an incorrect scope assignment of the warnings class

DefectDojo#13225 (comment)

* Update dojo/tools/api_blackduck/api_client.py

* Update dojo/tools/api_blackduck/api_client.py

Author: Maffooch

dojo/tools/api_blackduck/api_client.py

@@ -2,8 +2,9 @@
 
 # Ignore DeprecationWarning from the blackduck library because we cannot do anything about it
 # until they fix it in their library
-warnings.filterwarnings("ignore", category=DeprecationWarning)
-from blackduck import Client  # noqa: E402
+# TODO: Corrects https://github.com/DefectDojo/django-DefectDojo/issues/13218 in the short term
+with warnings.catch_warnings(action="ignore", category=DeprecationWarning):
+    from blackduck import Client
 
 
 class BlackduckAPI: