Bump ERC1967Utils pragma to 0.8.21 and set Slither CI version to 0.10.1 (#5005)

Co-authored-by: Hadrien Croubois <hadrien.croubois@gmail.com>
Co-authored-by: ernestognw <ernestognw@gmail.com>

.github/workflows/checks.yml

@@ -118,6 +118,7 @@ jobs:
       - uses: crytic/slither-action@v0.3.2
         with:
           node-version: 18.15
+          slither-version: 0.10.1
 
   codespell:
     runs-on: ubuntu-latest

CHANGELOG.md

@@ -1,5 +1,9 @@
 # Changelog
 
+### Breaking changes
+
+- `ERC1967Utils`: Removed duplicate declaration of the `Upgraded`, `AdminChanged` and `BeaconUpgraded` events. These events are still available through the `IERC1967` interface located under the `contracts/interfaces/` directory. Minimum pragma version is now 0.8.21.
+
 ### Custom error changes
 
 This version comes with changes to the custom error identifiers. Contracts previously depending on the following errors should be replaced accordingly:

contracts/proxy/ERC1967/ERC1967Utils.sol

@@ -1,7 +1,7 @@
 // SPDX-License-Identifier: MIT
 // OpenZeppelin Contracts (last updated v5.0.0) (proxy/ERC1967/ERC1967Utils.sol)
 
-pragma solidity ^0.8.20;
+pragma solidity ^0.8.21;
 
 import {IBeacon} from "../beacon/IBeacon.sol";
 import {IERC1967} from "../../interfaces/IERC1967.sol";