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

test/unit/io.js

@@ -302,7 +302,6 @@ describe('Input/output', function () {
   });
 
   it('Fail when input is empty Buffer', function (done) {
-    if (sharp.format.magick.input.buffer) return this.skip(); // can be removed with libvips 8.10.1+
     sharp(Buffer.alloc(0)).toBuffer().then(function () {
       assert(false);
       done();