package/systemd: bump to v243.4

Upstream systemd-stable has started tagging point releses.

The commit we currently used has now been tagged as v243.3, and this
brings us to v243.4.

Signed-off-by: Jérémy Rosen <jeremy.rosen@smile.fr>
[yann.morin.1998@free.fr:
  - expand commit log to explain previous version
]
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>

package/systemd/systemd.hash

@@ -1,5 +1,5 @@
 # sha256 locally computed
-sha256	d9cb11fab907292c61f66ef8ad2d9a68054c0e8856bd47cd2b0a12b2255da771  	systemd-243-78-gef677436aa.tar.gz
+sha256	281bc47aa6b173c3c6fa1bbc88aea84ecb014313aeb679c54f8885dd09e434be	systemd-243.4.tar.gz
 sha256	ab15fd526bd8dd18a9e77ebc139656bf4d33e97fc7238cd11bf60e2b9b8666c6	LICENSE.GPL2
 sha256	dc626520dcd53a22f727af3ee42c770e56c97a64fe3adb063799d8ab032fe551	LICENSE.LGPL2.1
 sha256	3a3b3cbd0ef03c7045bfda9b61062bdc33ad4913b44a6b6147043f26d00b51bf	README

package/systemd/systemd.mk

@@ -4,7 +4,7 @@
 #
 ################################################################################
 
-SYSTEMD_VERSION = 243-78-gef677436aa
+SYSTEMD_VERSION = 243.4
 SYSTEMD_SITE = $(call github,systemd,systemd-stable,v$(SYSTEMD_VERSION))
 SYSTEMD_LICENSE = LGPL-2.1+, GPL-2.0+ (udev), Public Domain (few source files, see README)
 SYSTEMD_LICENSE_FILES = LICENSE.GPL2 LICENSE.LGPL2.1 README