refactor(contracts): update solidity version in contracts (#1013)

Author: vplasencia

packages/contracts/contracts/Semaphore.sol

@@ -1,5 +1,5 @@
 // SPDX-License-Identifier: MIT
-pragma solidity >=0.8.23 <=0.8.28;
+pragma solidity >=0.8.23 <0.9.0;
 
 import {ISemaphore} from "./interfaces/ISemaphore.sol";
 import {ISemaphoreVerifier} from "./interfaces/ISemaphoreVerifier.sol";

packages/contracts/contracts/interfaces/ISemaphore.sol

@@ -1,5 +1,5 @@
 //SPDX-License-Identifier: MIT
-pragma solidity >=0.8.23 <=0.8.28;
+pragma solidity >=0.8.23 <0.9.0;
 
 /// @title Semaphore contract interface.
 interface ISemaphore {

packages/contracts/contracts/interfaces/ISemaphoreGroups.sol

@@ -1,5 +1,5 @@
 //SPDX-License-Identifier: MIT
-pragma solidity >=0.8.23 <=0.8.28;
+pragma solidity >=0.8.23 <0.9.0;
 
 /// @title SemaphoreGroups contract interface.
 interface ISemaphoreGroups {

packages/contracts/contracts/interfaces/ISemaphoreVerifier.sol

@@ -1,5 +1,5 @@
 //SPDX-License-Identifier: MIT
-pragma solidity >=0.8.23 <=0.8.28;
+pragma solidity >=0.8.23 <0.9.0;
 
 /// @title SemaphoreVerifier contract interface.
 interface ISemaphoreVerifier {