Ext: Update to SVT-AV1 v0.9.1

ext/svt.sh

diff --git a/ext/svt.sh b/ext/svt.sh
index 8e3b0f9..0afa93e 100644
--- a/ext/svt.sh
+++ b/ext/svt.sh
@@ -2,7 +2,7 @@
 # then enable CMake's AVIF_CODEC_SVT and AVIF_LOCAL_SVT options.
 # cmake and ninja must be in your PATH.
 
-git clone -b v0.9.0 --depth 1 https://gitlab.com/AOMediaCodec/SVT-AV1.git
+git clone -b v0.9.1 --depth 1 https://gitlab.com/AOMediaCodec/SVT-AV1.git
 
 cd SVT-AV1
 cd Build/linux