Update projects/application-services/list_toolchain_updates_checks to check nss sha256sum

The file libs/build-all.sh in application-services includes the sha256sum of nss. We should update projects/application-services/list_toolchain_updates_checks to check this sha256sum to compare it with the one we use.

This will help for reviewing toolchain updates, and will also be useful later to automate the toolchain updates (when doing #41689).