stunnel: update version to 5.57

Signed-off-by: Florian Eckert <fe@dev.tdt.de>

net/stunnel/Makefile

@@ -8,7 +8,7 @@
 include $(TOPDIR)/rules.mk
 
 PKG_NAME:=stunnel
-PKG_VERSION:=5.56
+PKG_VERSION:=5.57
 PKG_RELEASE:=1
 
 PKG_LICENSE:=GPL-2.0-or-later
@@ -23,7 +23,7 @@ PKG_SOURCE_URL:= \
 	https://www.usenix.org.uk/mirrors/stunnel/archive/$(word 1, $(subst .,$(space),$(PKG_VERSION))).x/
 
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.gz
-PKG_HASH:=7384bfb356b9a89ddfee70b5ca494d187605bb516b4fff597e167f97e2236b22
+PKG_HASH:=af5ab973dde11807c38735b87bdd87563a47d2fa1c72a07929fcfce80a600fe1
 
 PKG_FIXUP:=autoreconf
 PKG_FIXUP:=patch-libtool