version bump python to fix failed deployments

Author: Dold

deployment/efs-file-manager-web.yaml

@@ -291,7 +291,7 @@ Resources:
       Handler: website_helper.lambda_handler
       MemorySize: 256
       Role: !GetAtt WebsiteHelperRole.Arn
-      Runtime: python3.6
+      Runtime: python3.9
       Timeout: 900
       Environment:
         Variables: