Merge release-v4.9 branch (#4274)

Co-authored-by: github-actions <41898282+github-actions[bot]@users.noreply.github.com>
Co-authored-by: Francisco Giordano <fg@frang.io>
Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>
Co-authored-by: Hadrien Croubois <hadrien.croubois@gmail.com>

package.json

@@ -1,7 +1,7 @@
 {
   "name": "openzeppelin-solidity",
   "description": "Secure Smart Contract library for Solidity",
-  "version": "4.8.2",
+  "version": "4.9.0",
   "files": [
     "/contracts/**/*.sol",
     "/build/contracts/*.json",