depends: xcb-proto 1.15.2

Summary:

Resolves build failures under Python 3.12
[...]
`imp` was removed in 3.12: https://docs.python.org/3/library/imp.html.

Backport of core#28097.

Test Plan: Run the guix Linux build.

Reviewers: #bitcoin_abc, PiRK

Reviewed By: #bitcoin_abc, PiRK

Differential Revision: https://reviews.bitcoinabc.org/D17397