Merge upstream release-v4.3 into patched/release-v4.3

CHANGELOG.md

 # Changelog
 
-## 4.3.0
+## 4.3.0 (2021-08-17)
 
  * `ERC2771Context`: use private variable from storage to store the forwarder address. Fixes issues where `_msgSender()` was not callable from constructors. ([#2754](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/2754))
  * `EnumerableSet`: add `values()` functions that returns an array containing all values in a single call. ([#2768](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/2768))

contracts/package.json

 {
   "name": "@openzeppelin/contracts-upgradeable",
   "description": "Secure Smart Contract library for Solidity",
-  "version": "4.3.0-rc.0",
+  "version": "4.3.0",
   "files": [
     "**/*.sol",
     "/build/contracts/*.json",

package-lock.json

 {
   "name": "openzeppelin-solidity",
-  "version": "4.3.0-rc.0",
+  "version": "4.3.0",
   "lockfileVersion": 2,
   "requires": true,
   "packages": {

package.json

@@ -2,7 +2,7 @@
   "private": true,
   "name": "openzeppelin-solidity",
   "description": "Secure Smart Contract library for Solidity",
-  "version": "4.3.0-rc.0",
+  "version": "4.3.0",
   "files": [
     "/contracts/**/*.sol",
     "/build/contracts/*.json",