Provide references for CVE-2021-39229.
Where can I find more information about CVE-2021-39229?
References are available at: https://github.com/caronc/apprise/security/advisories/GHSA-qhmp-h54x-38qr, https://github.com/caronc/apprise/pull/436, https://github.com/caronc/apprise/blob/0007eade20934ddef0aba38b8f1aad980cfff253/apprise/plugins/NotifyIFTTT.py#L356-L359.