Upgrade to libvips 8.10.5, AVIF support in prebuilt binaries

Remove experimental status from HEIF, changing defaults
to prefer royalty-free AV1 over patent-encumbered HEVC

src/sharp.cc

@@ -22,6 +22,7 @@
 #include "stats.h"
 
 static void* sharp_vips_init(void*) {
+  g_setenv("VIPS_MIN_STACK_SIZE", "2m", FALSE);
   vips_init("sharp");
   return nullptr;
 }