CircleCI: fix invalid import

[syntrust]

Error log:

   - Unable to resolve imports:
     "src/L2/interfaces/ISoulGasToken.sol" in "/root/project/packages/contracts-bedrock/test/setup/Setup.sol"
  [⠢] Unable to resolve imports:ackages/contracts-bedrock/lib/solmate/src/
     "src/L2/interfaces/ISoulGasToken.sol" in "/root/project/packages/contracts-bedrock/test/setup/Setup.sol"
import { ISoulGasToken } from "src/L2/interfaces/ISoulGasToken.sol

This error causes the failure of

• contracts-bedrock-coverage,
• contracts-bedrock-build-coverage,
• contracts-bedrock-build and the other jobs that depend on it.