Bump shell and image version

Change-Id: Idc2c0a894173dc9c163042f40bf388d755ffbe8c

Author: Piotr Obrzut

VERSION

@@ -1,4 +1,4 @@
-IMAGE_VERSION=1.1.14
+IMAGE_VERSION=1.1.15
 
 declare -A MYSQL_SERVER_VERSIONS
 MYSQL_SERVER_VERSIONS["5.6"]=5.6.47
@@ -7,8 +7,8 @@ MYSQL_SERVER_VERSIONS["8.0"]=8.0.19
 
 declare -A MYSQL_SHELL_VERSIONS
 MYSQL_SHELL_VERSIONS["5.6"]=""
-MYSQL_SHELL_VERSIONS["5.7"]=8.0.18
-MYSQL_SHELL_VERSIONS["8.0"]=8.0.18
+MYSQL_SHELL_VERSIONS["5.7"]=8.0.19
+MYSQL_SHELL_VERSIONS["8.0"]=8.0.19
 
 declare -A FULL_SERVER_VERSIONS
 FULL_SERVER_VERSIONS["5.6"]="${MYSQL_SERVER_VERSIONS["5.6"]}-${IMAGE_VERSION}"