package/z3: bump to version 4.15.1

For change log since 4.13.3, see:
https://github.com/Z3Prover/z3/blob/z3-4.15.1/RELEASE_NOTES.md#version-4151

Signed-off-by: Julien Olivain <ju.o@free.fr>

package/z3/z3.hash

@@ -1,3 +1,3 @@
 # Locally calculated
-sha256  f59c9cf600ea57fb64ffeffbffd0f2d2b896854f339e846f48f069d23bc14ba0  z3-4.13.3.tar.gz
+sha256  ebf6eed5f2cb217d62abddaa94526189ae40bf3c415fb9c2e2128e099f16fda0  z3-4.15.1.tar.gz
 sha256  e617cad2ab9347e3129c2b171e87909332174e17961c5c3412d0799469111337  LICENSE.txt

package/z3/z3.mk

@@ -4,7 +4,7 @@
 #
 ################################################################################
 
-Z3_VERSION = 4.13.3
+Z3_VERSION = 4.15.1
 Z3_SITE = $(call github,Z3Prover,z3,z3-$(Z3_VERSION))
 Z3_LICENSE = MIT
 Z3_LICENSE_FILES = LICENSE.txt