Bug#955521: libsass: patch for using autopkgtests in cross-environments

[Gianfranco Costamagna]

hello, looks like I can't open a merge request from my forked project.

this is the commit id:

https://salsa.debian.org/locutusofborg/libsass/-/commit/b89fdbd02fb2d076a07a8d7bea0837efac866227

G.