component/haproxy: Version up from 2.2 to 2.4

2.4 implementes url normalization, needed on front facing part, see
https://cbonte.github.io/haproxy-dconv/2.4/configuration.html#4.2-http-request%20normalize-uri

component/haproxy/buildout.cfg

@@ -13,8 +13,8 @@ parts = haproxy
 [haproxy]
 recipe = slapos.recipe.cmmi
 shared = true
-url = http://www.haproxy.org/download/2.0/src/haproxy-2.0.25.tar.gz
-md5sum = 44687c901910da46711441ae1611b8ce
+url = http://www.haproxy.org/download/2.4/src/haproxy-2.4.7.tar.gz
+md5sum = 67d28ee9a39973bf17a38563d39ea81e
 configure-command = true
 # for Linux kernel 2.6.28 and above, we use "linux-glibc" as the TARGET,
 # otherwise use "generic".