umbim: bump to git HEAD

 de56231 umbim: fix compilation with GCC 10

Signed-off-by: Stijn Tintel <stijn@linux-ipv6.be>
Acked-by: Hauke Mehrtens <hauke@hauke-m.de>

package/network/utils/umbim/Makefile

@@ -5,9 +5,9 @@ PKG_RELEASE:=$(AUTORELEASE)
 
 PKG_SOURCE_PROTO:=git
 PKG_SOURCE_URL=$(PROJECT_GIT)/project/umbim.git
-PKG_SOURCE_DATE:=2019-09-11
-PKG_SOURCE_VERSION:=184b707ddaa0acee84d02e0ffe599cb8b67782bd
-PKG_MIRROR_HASH:=482ff69144f81fafed99035840f5a24e772472f2df2f3ac0219d6de791ac5835
+PKG_SOURCE_DATE:=2021-08-18
+PKG_SOURCE_VERSION:=de5623104baee6e0c13c92f05c15bf4b4145c0b1
+PKG_MIRROR_HASH:=2d4a75d2b53c8413521a2fd138895e327bff3f4b4d29a540342b2d2e1e009852
 PKG_MAINTAINER:=John Crispin <john@phrozen.org>
 
 PKG_LICENSE:=GPL-2.0