optimism: Hardhat config error while building bedrock

Describe the bug

hardhat.config.ts:54:5 - error TS2322: Type '{ deploy: string; deployments: string; deployConfig: string; }' is not assignable to type 'ProjectPathsUserConfig'.
  Object literal may only specify known properties, and 'deployConfig' does not exist in type 'ProjectPathsUserConfig'.

while building bedrock

To Reproduce Steps to reproduce the behavior:

1. clone repo
2. cd optimism/packages/contracts-bedrock
3. yarn
4. yarn build

Screenshots

Additional context Foundry is installed.