graphics/vulkan-headers: update to 1.3.284

Force rebuild vulkan-loader to make sure vulkaninfo shows the new version.

Changes:	https://github.com/KhronosGroup/Vulkan-Headers/compare/v1.3.283...v1.3.284
Reported by:	Repology, portscout

graphics/vulkan-headers/Makefile

 PORTNAME=	vulkan-headers
 DISTVERSIONPREFIX=	v
-DISTVERSION=	1.3.283
+DISTVERSION=	1.3.284
 CATEGORIES=	graphics
 
 MAINTAINER=	jbeich@FreeBSD.org

graphics/vulkan-headers/distinfo

-TIMESTAMP = 1713509657
-SHA256 (KhronosGroup-Vulkan-Headers-v1.3.283_GH0.tar.gz) = a76ff77815012c76abc9811215c2167128a73a697bcc23948e858d1f7dd54a85
-SIZE (KhronosGroup-Vulkan-Headers-v1.3.283_GH0.tar.gz) = 2271437
+TIMESTAMP = 1714973737
+SHA256 (KhronosGroup-Vulkan-Headers-v1.3.284_GH0.tar.gz) = 141619d4ce53814802a9311112902a95749ba16b32c0ee7997335c4988689686
+SIZE (KhronosGroup-Vulkan-Headers-v1.3.284_GH0.tar.gz) = 2274858

graphics/vulkan-loader/Makefile

 PORTNAME=	vulkan-loader
 DISTVERSIONPREFIX=	v
 DISTVERSION=	1.3.283
+PORTREVISION=	1
 CATEGORIES=	graphics devel
 
 MAINTAINER=	jbeich@FreeBSD.org