Updating Mozilla Dependencies

Workflow of updating dependencies for a new Firefox-version

rust-cbindgen

1. Install cargo if you haven't already
2. Go to https://github.com/eqrion/cbindgen/releases and pick the release you need
3. Download the tar-ball into your OBS-repo
4. Extract the tarball
5. Go into the extracted directory
6. Do cargo vendor && tar -cJf ../vendor.tar.xz vendor
7. Change version in spec-file
8. Copy and paste content of CHANGES to the changes-file