message: Add Elena as a code owner of the contracts package
diff: l2geth/ @smartcontracts @tynes @karlfloersch
  packages/specs/l2geth/ @smartcontracts @tynes @karlfloersch
  -packages/contracts/ @smartcontracts @ben-chain @maurelian
  +packages/contracts/ @smartcontracts @ben-chain @maurelian @elenadimitrova
  packages/specs/protocol/ @smartcontracts @ben-chain @maurelian
  ops/ @tynes @karlfloersch
  packages/hardhat-ovm/ @smartcontracts
  