chore: bump version to 2.5.7 and fix test assertions

- Bump package version from 2.5.6 to 2.5.7
- Update test assertions in cross-chain-proof-validator.test.ts to properly
  handle custom Solidity errors using revertedWithCustomError

Technical changes:
- Update package.json version
- Replace revertedWith with revertedWithCustomError in test cases

contracts/package.json

@@ -1,7 +1,7 @@
 {
   "name": "@iden3/contracts",
   "description": "Smart Contract library for Solidity",
-  "version": "2.5.6",
+  "version": "2.5.7",
   "files": [
     "**/*.sol",
     "/build/contracts/*.json",

test/cross-chain/cross-chain-proof-validator.test.ts

@@ -6,7 +6,7 @@ import {
 } from "../utils/packData";
 import { expect } from "chai";
 import { DeployHelper } from "../../helpers/DeployHelper";
-import { Contract } from "ethers";
+import { Contract, ZeroAddress } from "ethers";
 import { ethers } from "hardhat";
 import { loadFixture } from "@nomicfoundation/hardhat-toolbox/network-helpers";
 
@@ -180,3 +180,48 @@ describe("State Cross Chain", function () {
     );
   });
 });
+
+describe("Oracle Signing Address Validation", function () {
+  let CrossChainProofValidatorFactory;
+  let crossChainProofValidator;
+  let otherAccount;
+  const oracleSigningAddress = "0x1234567890123456789012345678901234567890";
+
+  before(async function () {
+    [, otherAccount] = await ethers.getSigners();
+    CrossChainProofValidatorFactory = await ethers.getContractFactory("CrossChainProofValidator");
+  });
+
+  it("should deploy with correct parameters", async function () {
+    crossChainProofValidator = await CrossChainProofValidatorFactory.deploy(
+      "StateInfo",
+      "1",
+      oracleSigningAddress,
+    );
+    await crossChainProofValidator.waitForDeployment();
+    expect(await crossChainProofValidator.getOracleSigningAddress()).to.equal(oracleSigningAddress);
+  });
+
+  it("should revert when deploying with zero oracle signing address", async function () {
+    await expect(
+      CrossChainProofValidatorFactory.deploy("TestDomain", "1", ZeroAddress),
+    ).to.be.revertedWithCustomError(
+      CrossChainProofValidatorFactory,
+      "OracleSigningAddressShouldNotBeZero",
+    );
+  });
+
+  it("should set a new oracle signing address", async function () {
+    await crossChainProofValidator.setOracleSigningAddress(otherAccount.address);
+    expect(await crossChainProofValidator.getOracleSigningAddress()).to.equal(otherAccount.address);
+  });
+
+  it("should revert when setting oracle signing address to zero", async function () {
+    await expect(
+      crossChainProofValidator.setOracleSigningAddress(ZeroAddress),
+    ).to.be.revertedWithCustomError(
+      crossChainProofValidator,
+      "OracleSigningAddressShouldNotBeZero",
+    );
+  });
+});