community/folks: upgrade to 0.15.3

build of current version fails on 3.15 builders, and applying patches does not help

https://gitlab.gnome.org/GNOME/folks/-/issues/131

-usr/lib/libfolks-dummy.so.25
-usr/lib/libfolks-dummy.so.25.21.0
-usr/lib/libfolks-eds.so.25
-usr/lib/libfolks-eds.so.25.21.0
-usr/lib/libfolks-telepathy.so.25
-usr/lib/libfolks-telepathy.so.25.21.0
-usr/lib/libfolks.so.25
-usr/lib/libfolks.so.25.21.0
+usr/lib/libfolks.so.26
+usr/lib/libfolks.so.26.0.0
+usr/lib/libfolks-dummy.so.26
+usr/lib/libfolks-dummy.so.26.0.0
+usr/lib/libfolks-eds.so.26
+usr/lib/libfolks-eds.so.26.0.0
+usr/lib/libfolks-telepathy.so.26
+usr/lib/libfolks-telepathy.so.26.0.0
+usr/lib/libfolks.so.26
+usr/lib/libfolks.so.26.0.0