package/dovecot: bump version to 2.2.21

Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/dovecot/dovecot.hash

@@ -1,2 +1,2 @@
 # Locally computed
-sha256 759e1e3f9d907cdaabad1f5fbacc793ca191d234c084bec3bba42966952a4e9f  dovecot-2.2.19.tar.gz
+sha256	7ab7139e59e1f0353bf9c24251f13c893cf1a6ef4bcc47e2d44de437108d0b20	dovecot-2.2.21.tar.gz

package/dovecot/dovecot.mk

@@ -5,7 +5,7 @@
 ################################################################################
 
 DOVECOT_VERSION_MAJOR = 2.2
-DOVECOT_VERSION = $(DOVECOT_VERSION_MAJOR).19
+DOVECOT_VERSION = $(DOVECOT_VERSION_MAJOR).21
 DOVECOT_SITE = http://www.dovecot.org/releases/$(DOVECOT_VERSION_MAJOR)
 DOVECOT_INSTALL_STAGING = YES
 DOVECOT_LICENSE = LGPLv2.1