update libvpx to v1.15.1

Author: zoff99

circle_scripts/deps.sh

@@ -18,7 +18,7 @@ build_yasm="1"
 FORTIFY_FLAGS="" # "-D_FORTIFY_SOURCE=2"
 _FFMPEG_VERSION_="n7.1"
 _OPUS_VERSION_="v1.5.2"
-_VPX_VERSION_="v1.15.0"
+_VPX_VERSION_="v1.15.1"
 _LIBSODIUM_VERSION_="1.0.20-RELEASE"
 _X264_VERSION_="31e19f92f00c7003fa115047ce50978bc98c3a0d"
 ##_X265_VERSION_="1d117bed4747758b51bd2c124d738527e30392cb"