Update `vsce` dependency to 2.16.0+ to make `keytar` an optional dependency.

[commiterate]

azurite@3.35.0 currently locks vsce@2.15.0 which has keytar as a required dependency.

This breaks builds on Clang systems (e.g. Macs) because keytar's node-gyp build fails due to some invalid C code.

vsce@2.16.0 moves keytar to an optional dependency instead.

See NixOS/nixpkgs#449650 for more information.

Tasks:

• Bump vsce to 2.16.0 or higher.
• Release azurite@3.36.0.