Make upgradeTo and upgradeToAndCall public (#3959)

Co-authored-by: Francisco <fg@frang.io>

.changeset/five-ducks-develop.md

@@ -0,0 +1,5 @@
+---
+'openzeppelin-solidity': patch
+---
+
+`UUPSUpgradeable.sol`: Change visibility to the functions `upgradeTo ` and `upgradeToAndCall ` from `external` to `public`.

contracts/mocks/proxy/UUPSLegacy.sol

@@ -44,11 +44,11 @@ contract UUPSUpgradeableLegacyMock is UUPSUpgradeableMock {
     }
 
     // hooking into the old mechanism
-    function upgradeTo(address newImplementation) external override {
+    function upgradeTo(address newImplementation) public override {
         _upgradeToAndCallSecureLegacyV1(newImplementation, bytes(""), false);
     }
 
-    function upgradeToAndCall(address newImplementation, bytes memory data) external payable override {
+    function upgradeToAndCall(address newImplementation, bytes memory data) public payable override {
         _upgradeToAndCallSecureLegacyV1(newImplementation, data, false);
     }
 }

contracts/mocks/proxy/UUPSUpgradeableMock.sol

@@ -23,11 +23,11 @@ contract UUPSUpgradeableMock is NonUpgradeableMock, UUPSUpgradeable {
 }
 
 contract UUPSUpgradeableUnsafeMock is UUPSUpgradeableMock {
-    function upgradeTo(address newImplementation) external override {
+    function upgradeTo(address newImplementation) public override {
         ERC1967Upgrade._upgradeToAndCall(newImplementation, bytes(""), false);
     }
 
-    function upgradeToAndCall(address newImplementation, bytes memory data) external payable override {
+    function upgradeToAndCall(address newImplementation, bytes memory data) public payable override {
         ERC1967Upgrade._upgradeToAndCall(newImplementation, data, false);
     }
 }

contracts/proxy/utils/UUPSUpgradeable.sol

@@ -65,7 +65,7 @@ abstract contract UUPSUpgradeable is IERC1822Proxiable, ERC1967Upgrade {
      *
      * @custom:oz-upgrades-unsafe-allow-reachable delegatecall
      */
-    function upgradeTo(address newImplementation) external virtual onlyProxy {
+    function upgradeTo(address newImplementation) public virtual onlyProxy {
         _authorizeUpgrade(newImplementation);
         _upgradeToAndCallUUPS(newImplementation, new bytes(0), false);
     }
@@ -80,7 +80,7 @@ abstract contract UUPSUpgradeable is IERC1822Proxiable, ERC1967Upgrade {
      *
      * @custom:oz-upgrades-unsafe-allow-reachable delegatecall
      */
-    function upgradeToAndCall(address newImplementation, bytes memory data) external payable virtual onlyProxy {
+    function upgradeToAndCall(address newImplementation, bytes memory data) public payable virtual onlyProxy {
         _authorizeUpgrade(newImplementation);
         _upgradeToAndCallUUPS(newImplementation, data, true);
     }