graphics/gdal: Update to 3.9.3

Changes:	https://github.com/OSGeo/gdal/releases
		https://github.com/OSGeo/gdal/blob/release/3.9/NEWS.md

graphics/gdal/Makefile

 PORTNAME=	gdal
-PORTVERSION=	3.9.2
-PORTREVISION=	2
+PORTVERSION=	3.9.3
 CATEGORIES=	graphics geography
 MASTER_SITES=	https://download.osgeo.org/gdal/${PORTVERSION}/ \
 		LOCAL/sunpoet

graphics/gdal/distinfo

-TIMESTAMP = 1724084542
-SHA256 (gdal-3.9.2.tar.xz) = bfbcc9f087f012c36151c20c79f8eac9529e1e5298fbded79cd5a1365f0b113a
-SIZE (gdal-3.9.2.tar.xz) = 9102740
+TIMESTAMP = 1729509138
+SHA256 (gdal-3.9.3.tar.xz) = 34a037852ffe6d2163f1b8948a1aa7019ff767148aea55876c1339b22ad751f1
+SIZE (gdal-3.9.3.tar.xz) = 9110460