RFC: Old and broken version of cffi

[MartB]

seahub/requirements.txt

Line 24 in 0c1537a

cffi==1.14.0

This version is not supported on recent GCC installations, it errors out like this:

x-x86_64-3.10/c/_cffi_backend.o
    c/_cffi_backend.c: In function ‘ctypedescr_dealloc’:
    c/_cffi_backend.c:407:23: error: lvalue required as left operand of assignment
      407 |         Py_REFCNT(ct) = 43;
          |                       ^

It is fixed in 1.14.6 but I tested seahub with 1.15.1 successfully by replacing the cffi module.
Is there a reason this is tagged at 1.14.0?

The same issue is described here:
https://forum.seafile.com/t/seafile-community-edition-9-0-5-is-ready/16388/20

Edit: #5336 is the reason for not jumping to 1.15.X in 9.X but 1.14.X should be doable:

[freeplant]

We have updated the dependency in the master branch.

The dependencies will be included in version 10.0.