Update dependency django-storages to v1.12.3

Author: renovate-bot

requirements-container.txt

@@ -2,4 +2,4 @@ napalm==3.3.1
 ruamel.yaml==0.17.16
 django-auth-ldap==3.0.0
 google-crc32c==1.3.0
-django-storages[azure,boto3,dropbox,google,libcloud,sftp]==1.12.2
+django-storages[azure,boto3,dropbox,google,libcloud,sftp]==1.12.3