gnucash-on-flatpak master: Use sourceforge instead of bintray for boost.

[John Ralls]

Updated	 via  https://github.com/Gnucash/gnucash-on-flatpak/commit/96206c1b (commit)
	from  https://github.com/Gnucash/gnucash-on-flatpak/commit/afc2d15f (commit)



commit 96206c1bcd6eaed5c8bd68e0bed9525b16ad3b36
Author: John Ralls <jralls at ceridwen.us>
Date:   Sun Mar 29 11:29:00 2020 -0700

    Use sourceforge instead of bintray for boost.
    
    Because bintray returns 503 access forbidden for all boost tarballs.



Summary of changes:
 modules/boost.json | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)