firewall4: update to latest Git HEAD

fc83d46 ruleset: set auto-merge directive for interval sets
9bce873 fw4: fix skipping invalid ipset entries
425ea8a fw4: fix applying zone flags for source bound rules

Signed-off-by: Jo-Philipp Wich <[email protected]>

package/network/config/firewall4/Makefile

@@ -9,9 +9,9 @@ PKG_RELEASE:=$(AUTORELEASE)
 
 PKG_SOURCE_PROTO:=git
 PKG_SOURCE_URL=$(PROJECT_GIT)/project/firewall4.git
-PKG_SOURCE_DATE:=2022-04-02
-PKG_SOURCE_VERSION:=a3788839d61742799b6c62f2d8790c464b7374fc
-PKG_MIRROR_HASH:=9b1c5d27d7d0022388693db679f9518216932ed1f39c096e1242c4d9e3fd897a
+PKG_SOURCE_DATE:=2022-04-21
+PKG_SOURCE_VERSION:=fc83d462621476be3b2861a93ac3a641e3f717c8
+PKG_MIRROR_HASH:=ca0438e04951d2c2ed58ccfca4f4a5b74f7ae96fa5560e98f8d8c5e9d083f451
 PKG_MAINTAINER:=Jo-Philipp Wich <[email protected]>
 PKG_LICENSE:=ISC