Bump @openzeppelin/contracts in /packages/cli/examples/truffle (#2)

Bumps [@openzeppelin/contracts](https://github.com/OpenZeppelin/openzeppelin-contracts) from 4.7.1 to 4.7.3.
- [Release notes](https://github.com/OpenZeppelin/openzeppelin-contracts/releases)
- [Changelog](https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/CHANGELOG.md)
- [Commits](OpenZeppelin/openzeppelin-contracts@v4.7.1...v4.7.3)

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

Signed-off-by: dependabot[bot] <[email protected]>

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

packages/cli/examples/truffle/package-lock.json

@@ -2,7 +2,7 @@
   "name": "truffle-project",
   "private": true,
   "dependencies": {
-    "@openzeppelin/contracts": "^4.7.1",
+    "@openzeppelin/contracts": "^4.7.3",
     "@thirdweb-dev/contracts": "^2.3.8",
     "truffle": "^5.5.18"
   },