build(deps-dev): Bump @openzeppelin/contracts

Bumps [@openzeppelin/contracts](https://github.com/OpenZeppelin/openzeppelin-contracts) from 4.4.2 to 4.9.3.
- [Release notes](https://github.com/OpenZeppelin/openzeppelin-contracts/releases)
- [Changelog](https://github.com/OpenZeppelin/openzeppelin-contracts/blob/v4.9.3/CHANGELOG.md)
- [Commits](OpenZeppelin/openzeppelin-contracts@v4.4.2...v4.9.3)

---
updated-dependencies:
- dependency-name: "@openzeppelin/contracts"
  dependency-type: direct:development
...

Signed-off-by: dependabot[bot] <support@github.com>

packages/smart-contracts/package.json

@@ -58,7 +58,7 @@
     "@nomiclabs/hardhat-etherscan": "3.1.7",
     "@nomiclabs/hardhat-waffle": "2.0.1",
     "@nomiclabs/hardhat-web3": "2.0.0",
-    "@openzeppelin/contracts": "4.4.2",
+    "@openzeppelin/contracts": "4.9.3",
     "@openzeppelin/test-helpers": "0.5.6",
     "@requestnetwork/currency": "0.9.0",
     "@requestnetwork/types": "0.36.0",