upgrade log4j2 version to 2.15.0

--- a/+ 1
+++ b/+ 1
@@ -1 +1 @@
 Subproject commit 3b533cb94bec300c6bc4935d3c0a2db0257c19a4
 Subproject commit 3a09f4400e14795c33be09e075a51e084300f061
--- a/libs/kvdb
+++ b/libs/kvdb
@@ -1 +1 @@
 Subproject commit 9a7235f1eb63f7f22bc1f5995778633c9a086c89
 Subproject commit e5aa0911ff35dbf239fdaa29854e9c15171759c7
--- a/+ 1
+++ b/+ 1
@@ -1 +1 @@
 Subproject commit f3ecdaaaaea64b59b60200d9a2d13665d99dfccf
 Subproject commit f03017928017b698c5ee40312c957de77b45d624