TT#6831 make sms_journal utf8mb4 aware

this operation is lossless, but the inversion isn't necessarily

Change-Id: I812257115df0292df9d0af7b4aeabdaf5efff490

db_scripts/diff/15307.up

@@ -0,0 +1,3 @@
+USE provisioning;
+
+ALTER TABLE sms_journal CONVERT TO CHARACTER SET utf8mb4;