feat: upgrade to use new Eigen version

[taturosati]

Update contracts to use new eigen version that will be released soon

Links & Guides

• core-contracts: v0.3.0-rc0-holesky-preprod-payments
• middleware-contracts: v0.2.0-rc1-holesky-preprod-payments
• smart contract docs: https://github.com/Layr-Labs/eigenlayer-contracts/blob/v0.3.0-rc0-holesky-preprod-payments/docs/core/PaymentCoordinator.md
• AVS ServiceManager Upgrade guide: https://hackmd.io/@Un8fEZ9aRy25eV1YL7KHZA/ry-a0w8z0#AVS-Payments-Upgrade-guide

[MauroToscano]

This shouldn't be merged until the new testnet gets upgraded