fix: Fix licenses (#1710)

Author: m30m

express_relay/examples/easy_lend/contracts/EasyLend.sol

@@ -1,4 +1,4 @@
-// Copyright (C) 2024 Lavra Holdings Limited - All Rights Reserved
+// SPDX-License-Identifier: Apache 2
 pragma solidity ^0.8.13;
 
 import "./EasyLendStructs.sol";

express_relay/examples/easy_lend/contracts/EasyLendErrors.sol

@@ -1,4 +1,4 @@
-// Copyright (C) 2024 Lavra Holdings Limited - All Rights Reserved
+// SPDX-License-Identifier: Apache 2
 pragma solidity ^0.8.13;
 
 // Signature: 0xe922edfd

express_relay/examples/easy_lend/contracts/EasyLendStructs.sol

@@ -1,4 +1,4 @@
-// Copyright (C) 2024 Lavra Holdings Limited - All Rights Reserved
+// SPDX-License-Identifier: Apache 2
 pragma solidity ^0.8.13;
 
 struct Vault {

express_relay/sdk/python/pyproject.toml

@@ -3,7 +3,7 @@ name = "express-relay"
 version = "0.6.0"
 description = "Utilities for searchers and protocols to interact with the Express Relay protocol."
 authors = ["dourolabs"]
-license = "Proprietary"
+license = "Apache-2.0"
 readme = "README.md"
 
 [tool.poetry.dependencies]

express_relay/sdk/solidity/IExpressRelay.sol

@@ -1,5 +1,4 @@
-// SPDX-License-Identifier: UNLICENSED
-// Copyright (C) 2024 Lavra Holdings Limited - All Rights Reserved
+// SPDX-License-Identifier: Apache 2
 pragma solidity ^0.8.0;
 
 interface IExpressRelay {

express_relay/sdk/solidity/IExpressRelayFeeReceiver.sol

@@ -1,5 +1,4 @@
-// SPDX-License-Identifier: UNLICENSED
-// Copyright (C) 2024 Lavra Holdings Limited - All Rights Reserved
+// SPDX-License-Identifier: Apache 2
 pragma solidity ^0.8.0;
 
 interface IExpressRelayFeeReceiver {

target_chains/ethereum/contracts/contracts/executor/Executor.sol

@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: UNLICENSED
+// SPDX-License-Identifier: Apache 2
 pragma solidity ^0.8.0;
 
 import "../pyth/PythGovernanceInstructions.sol";

target_chains/ethereum/contracts/contracts/executor/ExecutorErrors.sol

@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: UNLICENSED
+// SPDX-License-Identifier: Apache 2
 pragma solidity ^0.8.0;
 
 library ExecutorErrors {