Update dependencies to keep-ecdsa and tbtc-v2 packages

We have published new `@keep-network/ecdsa` and `@keep-network/tbtc-v2`
packages. Those packages no longer include the `prepare-dependencies.sh` script
from `@threshold-network/solidity-contracts` which was causing random failures
during `yarn install`. As in some CI jobs we install the dependencies based on
the lockfile (with the `--frozen-lockfile` flag), we need to update dependencies
in the lockfile so that the new, improved packages would be used.