package/haproxy: security bump to version 2.2.16

Fixes the following security issues:

- CVE-2021-39240: An issue was discovered in HAProxy 2.2 before 2.2.16, 2.3
  before 2.3.13, and 2.4 before 2.4.3.  It does not ensure that the scheme
  and path portions of a URI have the expected characters.  For example, the
  authority field (as observed on a target HTTP/2 server) might differ from
  what the routing rules were intended to achieve.

- CVE-2021-39241: An issue was discovered in HAProxy 2.0 before 2.0.24, 2.2
  before 2.2.16, 2.3 before 2.3.13, and 2.4 before 2.4.3.  An HTTP method
  name may contain a space followed by the name of a protected resource.  It
  is possible that a server would interpret this as a request for that
  protected resource, such as in the "GET /admin?  HTTP/1.1 /static/images
  HTTP/1.1" example.

- CVE-2021-39242: An issue was discovered in HAProxy 2.2 before 2.2.16, 2.3
  before 2.3.13, and 2.4 before 2.4.3.  It can lead to a situation with an
  attacker-controlled HTTP Host header, because a mismatch between Host and
  authority is mishandled.

For more details, see the advisory:
https://www.mail-archive.com/haproxy@formilux.org/msg41041.html

Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/haproxy/haproxy.mk

@@ -5,7 +5,7 @@
 ################################################################################
 
 HAPROXY_VERSION_MAJOR = 2.2
-HAPROXY_VERSION = $(HAPROXY_VERSION_MAJOR).14
+HAPROXY_VERSION = $(HAPROXY_VERSION_MAJOR).16
 HAPROXY_SITE = http://www.haproxy.org/download/$(HAPROXY_VERSION_MAJOR)/src
 HAPROXY_LICENSE = GPL-2.0+ and LGPL-2.1+ with exceptions
 HAPROXY_LICENSE_FILES = LICENSE doc/lgpl.txt doc/gpl.txt