version up : stunnel 4.56.

disable FIPS explicitly, otherwise stunnel fails to start with the following output :

Threading:PTHREAD Sockets:POLL,IPv6 SSL:ENGINE,OCSP,FIPS
Reading configuration from file etc/stunnel.conf
FIPS_mode_set: F06D065: error:0F06D065:common libcrypto routines:FIPS_mode_set:fips mode not supported
Line 5: "[remote]": Failed to initialize SSL

component/stunnel/buildout.cfg

@@ -17,12 +17,13 @@ filename = stunnel-4-hooks.py
 
 [stunnel-4]
 recipe = slapos.recipe.cmmi
-url = ftp://ftp.stunnel.org/stunnel/archive/4.x/stunnel-4.55.tar.gz
-md5sum = ebe6670368d30c6a01ca33b9c50cb239
+url = https://www.stunnel.org/downloads/stunnel-4.56.tar.gz
+md5sum = ac4c4a30bd7a55b6687cbd62d864054c
 pre-configure-hook = ${stunnel-4-hook-download:location}/${stunnel-4-hook-download:filename}:pre_configure_hook
 configure-options =
   --enable-ipv6
   --disable-libwrap
+  --disable-fips
   --with-ssl=${openssl:location}
 environment =
   CPPFLAGS=-I${zlib:location}/include