FIX: external_credentials_provider must call super.configure

src/caosdb/connection/authentication/external_credentials_provider.py

@@ -86,6 +86,7 @@ class ExternalCredentialsProvider(PlainTextCredentialsProvider, ABC):
                              "pycaosdb.ini) and should be avoided."),
                             authm)
         self._config = dict(config)
+        super(ExternalCredentialsProvider, self).configure(**config)
 
     @property
     def password(self):