Just found the reason that since some months is blocking Git Bash (https://gitforwindows.org/) to be easily updated on my Windows 10 Pro.
Disabling Avast Free Antivirus allows the update to work, otherwise:
$ git update-git-for-windows
curl: (35) schannel: next InitializeSecurityContext failed: Unknown error (0x80092012) - The revocation function was unable to check revocation for the certificate.
Thanks @Leo3487, much appreciated!
That is my plan which I consider as plan B ;).
Local MITM - which is quite sensitive on its own since you need to trust who is using that technique - should be transparent and not preventing the security of another software e.g. a security update: Git Bash has a daily update check which cannot work too.
I’m pretty sure that this issue affects even the paid version.