package/openvpn: bump version to 2.5.3

Release note:
https://forums.openvpn.net/viewtopic.php?f=20&t=32497

CVE-2021-3606 fixed by this release is only relevant for Windows.

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

package/openvpn/openvpn.hash

@@ -1,3 +1,3 @@
 # Locally calculated after checking signature
-sha256  b12743836901f365efaf82ab2493967e1b21c21eb43ce9a8da1002a17c9c1dc8  openvpn-2.5.2.tar.xz
+sha256  fb6a9943c603a1951ca13e9267653f8dd650c02f84bccd2b9d20f06a4c9c9a7e  openvpn-2.5.3.tar.xz
 sha256  1fcb78d7e478bb8a9408010bdc91b36e213b1facfad093df3f7ce7e28af19043  COPYRIGHT.GPL

package/openvpn/openvpn.mk

@@ -4,7 +4,7 @@
 #
 ################################################################################
 
-OPENVPN_VERSION = 2.5.2
+OPENVPN_VERSION = 2.5.3
 OPENVPN_SOURCE = openvpn-$(OPENVPN_VERSION).tar.xz
 OPENVPN_SITE = http://swupdate.openvpn.net/community/releases
 OPENVPN_DEPENDENCIES = host-pkgconf