pngcheck: upgrade 3.0.2 -> 3.0.3

The 3.0.3 source tarball is only published on libpng.org (SourceForge
has a win32 zip only), fetch it from there and check for updates there.

AI-Generated: Uses Claude Code
Signed-off-by: Khem Raj <khem.raj@oss.qualcomm.com>

meta-oe/recipes-support/pngcheck/pngcheck_3.0.3.bb

@@ -4,16 +4,16 @@ LICENSE = "GPL-2.0-only"
 LIC_FILES_CHKSUM = "file://gpl/COPYING;md5=b234ee4d69f5fce4486a80fdaf4a4263"
 DEPENDS = "zlib libpng"
 
-SRC_URI = "${SOURCEFORGE_MIRROR}/project/png-mng/${BPN}/${PV}/${BPN}-${PV}.tar.gz \
+SRC_URI = "http://www.libpng.org/pub/png/src/${BPN}-${PV}.tar.gz \
            file://10-pngsplit-format-strings.patch \
            file://0001-png-fix-IDAT-windowsize-Fix-format-string-errors-in-.patch \
            file://0001-make-Respect-variables-from-environement.patch \
            "
 
-SRC_URI[sha256sum] = "0d7e262f24116fddf2847a8ceb5c92d9f5f26efb42e9fff63ec2bb7676131ca7"
+SRC_URI[sha256sum] = "c36a4491634af751f7798ea421321642f9590faa032eccb0dd5fb4533609dee6"
 
-UPSTREAM_CHECK_URI = "https://sourceforge.net/projects/png-mng/files/pngcheck/"
-UPSTREAM_CHECK_REGEX = "${BPN}-(?P<pver>\d+(\.\d+)+)"
+UPSTREAM_CHECK_URI = "http://www.libpng.org/pub/png/apps/pngcheck.html"
+UPSTREAM_CHECK_REGEX = "${BPN}-(?P<pver>\d+(\.\d+)+)\.tar"
 
 CFLAGS += "-DUSE_ZLIB"