Update pragma to 0.8.20 (#4489)

Co-authored-by: Francisco Giordano <fg@frang.io>
Co-authored-by: ernestognw <ernestognw@gmail.com>

docs/modules/ROOT/pages/access-control.adoc

@@ -13,7 +13,7 @@ OpenZeppelin Contracts provides xref:api:access.adoc#Ownable[`Ownable`] for impl
 ----
 // contracts/MyContract.sol
 // SPDX-License-Identifier: MIT
-pragma solidity ^0.8.19;
+pragma solidity ^0.8.20;
 
 import {Ownable} from "@openzeppelin/contracts/access/Ownable.sol";
 
@@ -62,7 +62,7 @@ Here's a simple example of using `AccessControl` in an xref:tokens.adoc#ERC20[`E
 ----
 // contracts/MyToken.sol
 // SPDX-License-Identifier: MIT
-pragma solidity ^0.8.19;
+pragma solidity ^0.8.20;
 
 import {AccessControl} from "@openzeppelin/contracts/access/AccessControl.sol";
 import {ERC20} from "@openzeppelin/contracts/token/ERC20/ERC20.sol";
@@ -94,7 +94,7 @@ Let's augment our ERC20 token example by also defining a 'burner' role, which le
 ----
 // contracts/MyToken.sol
 // SPDX-License-Identifier: MIT
-pragma solidity ^0.8.19;
+pragma solidity ^0.8.20;
 
 import {AccessControl} from "@openzeppelin/contracts/access/AccessControl.sol";
 import {ERC20} from "@openzeppelin/contracts/token/ERC20/ERC20.sol";
@@ -139,7 +139,7 @@ Let's take a look at the ERC20 token example, this time taking advantage of the
 ----
 // contracts/MyToken.sol
 // SPDX-License-Identifier: MIT
-pragma solidity ^0.8.19;
+pragma solidity ^0.8.20;
 
 import {AccessControl} from "@openzeppelin/contracts/access/AccessControl.sol";
 import {ERC20} from "@openzeppelin/contracts/token/ERC20/ERC20.sol";

docs/modules/ROOT/pages/erc1155.adoc

@@ -34,7 +34,7 @@ Here's what a contract for tokenized items might look like:
 ----
 // contracts/GameItems.sol
 // SPDX-License-Identifier: MIT
-pragma solidity ^0.8.19;
+pragma solidity ^0.8.20;
 
 import {ERC1155} from "@openzeppelin/contracts/token/ERC1155/ERC1155.sol";
 
@@ -134,7 +134,7 @@ In order for our contract to receive ERC1155 tokens we can inherit from the conv
 ----
 // contracts/MyContract.sol
 // SPDX-License-Identifier: MIT
-pragma solidity ^0.8.19;
+pragma solidity ^0.8.20;
 
 import {ERC1155Holder} from "@openzeppelin/contracts/token/ERC1155/utils/ERC1155Holder.sol";
 

docs/modules/ROOT/pages/erc20.adoc

@@ -15,7 +15,7 @@ Here's what our GLD token might look like.
 ----
 // contracts/GLDToken.sol
 // SPDX-License-Identifier: MIT
-pragma solidity ^0.8.19;
+pragma solidity ^0.8.20;
 
 import {ERC20} from "@openzeppelin/contracts/token/ERC20/ERC20.sol";
 

docs/modules/ROOT/pages/erc721.adoc

@@ -14,7 +14,7 @@ Here's what a contract for tokenized items might look like:
 ----
 // contracts/GameItem.sol
 // SPDX-License-Identifier: MIT
-pragma solidity ^0.8.19;
+pragma solidity ^0.8.20;
 
 import {ERC721URIStorage} from "@openzeppelin/contracts/token/ERC721/extensions/ERC721URIStorage.sol";
 

docs/modules/ROOT/pages/extending-contracts.adoc

@@ -20,7 +20,7 @@ For example, imagine you want to change xref:api:access.adoc#AccessControl[`Acce
 ```solidity
 // contracts/ModifiedAccessControl.sol
 // SPDX-License-Identifier: MIT
-pragma solidity ^0.8.19;
+pragma solidity ^0.8.20;
 
 import {AccessControl} from "@openzeppelin/contracts/access/AccessControl.sol";
 
@@ -48,7 +48,7 @@ Here is a modified version of xref:api:access.adoc#AccessControl[`AccessControl`
 ```solidity
 // contracts/ModifiedAccessControl.sol
 // SPDX-License-Identifier: MIT
-pragma solidity ^0.8.19;
+pragma solidity ^0.8.20;
 
 import {AccessControl} from "@openzeppelin/contracts/access/AccessControl.sol";
 
@@ -80,7 +80,7 @@ Hooks are simply functions that are called before or after some action takes pla
 Here's how you would implement the `IERC721Receiver` pattern in `ERC20`, using the xref:api:token/ERC20.adoc#ERC20-_beforeTokenTransfer-address-address-uint256-[`_beforeTokenTransfer`] hook:
 
 ```solidity
-pragma solidity ^0.8.19;
+pragma solidity ^0.8.20;
 
 import {ERC20} from "@openzeppelin/contracts/token/ERC20/ERC20.sol";
 

docs/modules/ROOT/pages/governance.adoc

@@ -198,7 +198,7 @@ The Governor will automatically detect the clock mode used by the token and adap
 
 ```solidity
 // SPDX-License-Identifier: MIT
-pragma solidity ^0.8.19;
+pragma solidity ^0.8.20;
 
 import {Governor} from "@openzeppelin/contracts/governance/Governor.sol";
 import {GovernorCompatibilityBravo} from "@openzeppelin/contracts/governance/compatibility/GovernorCompatibilityBravo.sol";

docs/modules/ROOT/pages/index.adoc

@@ -26,7 +26,7 @@ Once installed, you can use the contracts in the library by importing them:
 ----
 // contracts/MyNFT.sol
 // SPDX-License-Identifier: MIT
-pragma solidity ^0.8.19;
+pragma solidity ^0.8.20;
 
 import {ERC721} from "@openzeppelin/contracts/token/ERC721/ERC721.sol";
 

docs/modules/ROOT/pages/utilities.adoc

@@ -155,7 +155,7 @@ Consider this dummy contract:
 ----
 // contracts/Box.sol
 // SPDX-License-Identifier: MIT
-pragma solidity ^0.8.19;
+pragma solidity ^0.8.20;
 
 import "@openzeppelin/contracts/utils/Multicall.sol";