zstd: update to 1.5.6

Full changelog here:
https://github.com/facebook/zstd/releases/tag/v1.5.6

Signed-off-by: Paul Spooren <[email protected]>

tools/zstd/Makefile

@@ -1,11 +1,11 @@
 include $(TOPDIR)/rules.mk
 
 PKG_NAME:=zstd
-PKG_VERSION:=1.5.5
+PKG_VERSION:=1.5.6
 
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.gz
 PKG_SOURCE_URL:=https://github.com/facebook/zstd/releases/download/v$(PKG_VERSION)
-PKG_HASH:=9c4396cc829cfae319a6e2615202e82aad41372073482fce286fac78646d3ee4
+PKG_HASH:=8c29e06cf42aacc1eafc4077ae2ec6c6fcb96a626157e0593d5e82a34fd403c1
 
 PKG_LICENSE:=BSD-3-Clause
 PKG_LICENSE_FILES:=LICENSE