package/libmicrohttpd: bump version to 0.9.73

Release notes:
https://lists.gnu.org/archive/html/libmicrohttpd/2021-04/msg00000.html

Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>

package/libmicrohttpd/libmicrohttpd.hash

@@ -1,3 +1,3 @@
 # Locally calculated
-sha256  0ae825f8e0d7f41201fd44a0df1cf454c1cb0bc50fe9d59c26552260264c2ff8  libmicrohttpd-0.9.72.tar.gz
+sha256  a37b2f1b88fd1bfe74109586be463a434d34e773530fc2a74364cfcf734c032e  libmicrohttpd-0.9.73.tar.gz
 sha256  7399547209438c93f9b90297954698773d4846cea44cde5ca982c84c45952a3b  COPYING

package/libmicrohttpd/libmicrohttpd.mk

@@ -4,7 +4,7 @@
 #
 ################################################################################
 
-LIBMICROHTTPD_VERSION = 0.9.72
+LIBMICROHTTPD_VERSION = 0.9.73
 LIBMICROHTTPD_SITE = $(BR2_GNU_MIRROR)/libmicrohttpd
 LIBMICROHTTPD_LICENSE_FILES = COPYING
 LIBMICROHTTPD_CPE_ID_VENDOR = gnu