Migrate "threshold-crypto" crate from "failure" to "thiserror"

[dforsten]

Critical issue reported by dependabot.

[dforsten]

Already fixed with the newest commit on the "threshold-crypto" repo, but it is not labeled as a new version.
The "hbbft" crate needs to be patched to use that newest commit instead.

[dforsten]

The "fedmint" project maintains private forks of hbbft/threshold-crypto as well,
we may want to do the same:
https://github.com/fedimint

[dforsten]

I implemented the necessary changes, creating a PR to the poanetwork/hbbft repo.
In the meantime the changes are available on my private fork at:
https://github.com/dforsten/hbbft

[dforsten]

PR for the poanetwork hbbft repo submitted here:
poanetwork/hbbft#441

[SurfingNerd]

solved:
there is no critical issue anymore