Fix deprecated jwt decode method (#919)

Later versions of airflow removed this function on us, but looks like we can just use a function bound to the jwt library itself directly.

airflow/helm/airflow/Chart.yaml

@@ -2,7 +2,7 @@ apiVersion: v2
 name: airflow
 description: A Helm chart for airflow deployable on plural
 type: application
-version: 0.3.42
+version: 0.3.43
 appVersion: "2.6.3"
 sources:
   - https://github.com/pluralsh/plural-artifacts/airflow/helm/airflow

airflow/helm/airflow/values.yaml.tpl

@@ -68,7 +68,7 @@ airflow:
         class PluralSecurityManager(AirflowSecurityManager):
           def _get_oauth_user_info(self, provider, response):
               if provider == "plural":
-                  me = self._azure_jwt_token_parse(response["id_token"])
+                  me = jwt.decode(response["id_token"], options={"verify_signature": False})
                   split_name = me["name"].split()
                   return {
                       "username": me["name"],