bump version

CHANGES.md

 # eduGAIN Access Check Changelog
 
+## Version 1.2.3 (10/02/2022)
+
+* e-mail content rewording in a less alarmist tone
+
 ## Version 1.2.2 (19/10/2020)
 
 * mitigate metadata synchronisation error: just skip problematic entity,

configure.ac

 AC_PREREQ(2.59)
-AC_INIT([Access Check Manager], 1.2.2)
+AC_INIT([Access Check Manager], 1.2.3)
 AM_INIT_AUTOMAKE([foreign])
 AC_REQUIRE_AUX_FILE([tap-driver.sh])
 AC_PROG_LN_S