package/libcap: bump version to 2.73

For release note, see:
https://sites.google.com/site/fullycapable/release-notes-for-libcap#h.7yd7ab9ppagk

Signed-off-by: Petr Vorel <petr.vorel@gmail.com>
[Julien: add link to release note]
Signed-off-by: Julien Olivain <ju.o@free.fr>

package/libcap/libcap.hash

@@ -1,5 +1,5 @@
 # https://www.kernel.org/pub/linux/libs/security/linux-privs/libcap2/sha256sums.asc
-sha256  23a6ef8aadaf1e3e875f633bb2d116cfef8952dba7bc7c569b13458e1952b30f  libcap-2.70.tar.xz
+sha256  6405f6089cf4cdd8c271540cd990654d78dd0b1989b2d9bda20f933a75a795a5  libcap-2.73.tar.xz
 
 # Hash for license file:
 sha256  68467e731f4744bd6e0bb69e8df9c3a994e09cd6b203d0c41327ac6d079c581d  License

package/libcap/libcap.mk

@@ -4,7 +4,7 @@
 #
 ################################################################################
 
-LIBCAP_VERSION = 2.70
+LIBCAP_VERSION = 2.73
 LIBCAP_SITE = https://www.kernel.org/pub/linux/libs/security/linux-privs/libcap2
 LIBCAP_SOURCE = libcap-$(LIBCAP_VERSION).tar.xz
 LIBCAP_LICENSE = GPL-2.0 or BSD-3-Clause