package/dovecot: security bump to version 2.3.6

Fixes
* CVE-2019-11494: Submission-login crashed with signal 11 due to null
  pointer access when authentication was aborted by disconnecting.
* CVE-2019-11499: Submission-login crashed when authentication was
  started over TLS secured channel and invalid authentication message
  was sent.

Release notes:
https://dovecot.org/pipermail/dovecot-news/2019-April/000408.html

Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/dovecot/dovecot.hash

@@ -1,5 +1,5 @@
 # Locally computed after checking signature
-sha256 ba14e41aefd81a868a35b83bcb54194116106424d37690519b50ea83c0f31bf2  dovecot-2.3.5.2.tar.gz
+sha256 ed1d8dc1beeae9c6c73deac73a62ef19fe9262fbffd86604a3f690452f5536c7  dovecot-2.3.6.tar.gz
 sha256 a363b132e494f662d98c820d1481297e6ae72f194c2c91b6c39e1518b86240a8  COPYING
 sha256 dc626520dcd53a22f727af3ee42c770e56c97a64fe3adb063799d8ab032fe551  COPYING.LGPL
 sha256 52b8c95fabb19575281874b661ef7968ea47e8f5d74ba0dd40ce512e52b3fc97  COPYING.MIT

package/dovecot/dovecot.mk

@@ -5,7 +5,7 @@
 ################################################################################
 
 DOVECOT_VERSION_MAJOR = 2.3
-DOVECOT_VERSION = $(DOVECOT_VERSION_MAJOR).5.2
+DOVECOT_VERSION = $(DOVECOT_VERSION_MAJOR).6
 DOVECOT_SITE = https://www.dovecot.org/releases/$(DOVECOT_VERSION_MAJOR)
 DOVECOT_INSTALL_STAGING = YES
 DOVECOT_LICENSE = LGPL-2.1, MIT, Public Domain, BSD-3-Clause, Unicode-DFS-2015