(Debian packaging) update for new branch name

Author: Kyle Kloberdanz

debian/gbp.conf

@@ -20,6 +20,6 @@ prebuild = bash -c "
     rm -rf \$zlib_rm_files \$utf8proc_rm_files"
 
 upstream-tree = BRANCH
-upstream-branch = master
+upstream-branch = r1.25
 upstream-tag = %(version)s
-debian-branch = master
+debian-branch = r1.25