Update to libaom v3.15.3 release candidate 1

Fixes https://issues.oss-fuzz.com/issues/572842743.

CHANGELOG.md

diff --git a/CHANGELOG.md b/CHANGELOG.md
index ea346e4..41d7567 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -20,7 +20,7 @@
 
 ### Changed since 1.4.2
 
-* Update aom.cmd/LocalAom.cmake: v3.15.2
+* Update aom.cmd/LocalAom.cmake: v3.15.3-rc1
 * Update dav1d.cmd/dav1d_android.sh/LocalDav1d.cmake: 1.5.4
 * Update LocalAvm.cmake: v1.0.0
 * Update libyuv.cmd/LocalLibyuv.cmake: 26e56be0f (1960)

cmake/Modules/LocalAom.cmake

diff --git a/cmake/Modules/LocalAom.cmake b/cmake/Modules/LocalAom.cmake
index 4eec00f..3188d5e 100644
--- a/cmake/Modules/LocalAom.cmake
+++ b/cmake/Modules/LocalAom.cmake
@@ -1,4 +1,4 @@
-set(AVIF_AOM_GIT_TAG v3.15.2)
+set(AVIF_AOM_GIT_TAG v3.15.3-rc1)
 
 set(AOM_EXT_SOURCE_DIR "${AVIF_SOURCE_DIR}/ext/aom")
 set(LIB_FILENAME "${AOM_EXT_SOURCE_DIR}/build.libavif/${CMAKE_STATIC_LIBRARY_PREFIX}aom${CMAKE_STATIC_LIBRARY_SUFFIX}")

ext/aom.cmd

diff --git a/ext/aom.cmd b/ext/aom.cmd
index 1205932..f781f15 100755
--- a/ext/aom.cmd
+++ b/ext/aom.cmd
@@ -8,7 +8,7 @@
 : # If you're running this on Windows, be sure you've already run this (from your VC2019 install dir):
 : #     "C:\Program Files (x86)\Microsoft Visual Studio\2019\Professional\VC\Auxiliary\Build\vcvars64.bat"
 
-git clone -b v3.15.2 --depth 1 https://aomedia.googlesource.com/aom
+git clone -b v3.15.3-rc1 --depth 1 https://aomedia.googlesource.com/aom
 
 cmake -G Ninja -S aom -B aom/build.libavif -DBUILD_SHARED_LIBS=OFF -DCONFIG_PIC=1 -DCMAKE_BUILD_TYPE=Release -DENABLE_APPS=0 -DENABLE_DOCS=0 -DENABLE_EXAMPLES=0 -DENABLE_TESTDATA=0 -DENABLE_TESTS=0 -DENABLE_TOOLS=0
 cmake --build aom/build.libavif --config Release --parallel