Log Message:
libheif: update to 1.19.7.

1.19.7

Fixes a build error with SVT-AV1 encoder plugin when using reduced symbol \ 
visibility (#1480).

1.19.6

Bugfix release.

Additionally, there are the following changes:

    C++ and Go wrapper licenses have been changed to MIT
    supports SVT-AV1 v3.0.0 encoder
    support emscripten builds for ES6 modules