build(deps-dev): bump @nomicfoundation/hardhat-toolbox from 2.0.2 to 6.1.0 in /tools/hedera-crosschain-bridge (#4132)

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]