@Samuel_Gervais - Thank you very much for sharing your experience.
Just to add- there are two references to TLSv1.3 that must be removed and its perhaps easier to locate the nginx.conf file here: frappe/frappe-bench/config .
I too experienced the same challenge after upgrading to ERPNext v11.1.72 (version-11) : Frappe Framework: v11.1.64 (version-11) and had to resort to this workaround.
I hope this will help someone else in the future!