Bump shell and image version

Change-Id: I720b84a17170fa1e980bf725cd29f2acd1055098

Author: Piotr Obrzut

VERSION

@@ -1,12 +1,12 @@
-IMAGE_VERSION=1.1.14-cluster
+IMAGE_VERSION=1.1.15-cluster
 declare -A MYSQL_CLUSTER_VERSIONS
 MYSQL_CLUSTER_VERSIONS["7.5"]=7.5.17
 MYSQL_CLUSTER_VERSIONS["7.6"]=7.6.13
 MYSQL_CLUSTER_VERSIONS["8.0"]=8.0.19
 declare -A MYSQL_SHELL_VERSIONS
-MYSQL_SHELL_VERSIONS["7.5"]=8.0.18
-MYSQL_SHELL_VERSIONS["7.6"]=8.0.18
-MYSQL_SHELL_VERSIONS["8.0"]=8.0.18
+MYSQL_SHELL_VERSIONS["7.5"]=8.0.19
+MYSQL_SHELL_VERSIONS["7.6"]=8.0.19
+MYSQL_SHELL_VERSIONS["8.0"]=8.0.19
 
 declare -A SERVER_VERSION_FULL
 SERVER_VERSION_FULL["7.5"]="${MYSQL_CLUSTER_VERSIONS["7.5"]}-${IMAGE_VERSION}"