lib: bump soname version to 5:0:2

Algorithm used:
https://www.gnu.org/software/libtool/manual/html_node/Updating-version-info.html

(cherry picked from commit 804e4f7)

Author: pbrezina

src/lib/Makefile.am

@@ -87,7 +87,7 @@ libauthselect_la_CFLAGS = \
     $(NULL)
 libauthselect_la_LDFLAGS = \
     -Wl,--version-script=$(srcdir)/authselect.exports \
-    -version-info 4:1:1
+    -version-info 5:0:2
 
 pkgconfigdir = $(libdir)/pkgconfig
 pkgconfig_DATA = \