graphics/gdal: Update to 3.7.3

Changes:	https://github.com/OSGeo/gdal/releases
		https://github.com/OSGeo/gdal/blob/release/3.7/NEWS.md

graphics/gdal/Makefile

 PORTNAME=	gdal
-PORTVERSION=	3.7.2
-PORTREVISION=	3
+PORTVERSION=	3.7.3
 CATEGORIES=	graphics geography
 MASTER_SITES=	https://download.osgeo.org/gdal/${PORTVERSION}/ \
 		LOCAL/sunpoet

graphics/gdal/distinfo

-TIMESTAMP = 1695143259
-SHA256 (gdal-3.7.2.tar.xz) = 40c0068591d2c711c699bbb734319398485ab169116ac28005d8302f80b923ad
-SIZE (gdal-3.7.2.tar.xz) = 8619608
+TIMESTAMP = 1699774500
+SHA256 (gdal-3.7.3.tar.xz) = e0a6f0c453ea7eb7c09967f50ac49426808fcd8f259dbc9888140eb69d7ffee6
+SIZE (gdal-3.7.3.tar.xz) = 8625812