Bump @openzeppelin/contracts from 3.0.1 to 4.9.2

Bumps [@openzeppelin/contracts](https://github.com/OpenZeppelin/openzeppelin-contracts) from 3.0.1 to 4.9.2.
- [Release notes](https://github.com/OpenZeppelin/openzeppelin-contracts/releases)
- [Changelog](https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/CHANGELOG.md)
- [Commits](OpenZeppelin/openzeppelin-contracts@v3.0.1...v4.9.2)

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

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

examples/basic/package.json

@@ -19,7 +19,7 @@
     "mocha": "^7.1.2",
     "ts-node": "^8.9.1",
     "typescript": "^4.6.2",
-    "@openzeppelin/contracts": "^3.0.0"
+    "@openzeppelin/contracts": "^4.9.2"
   },
   "private": true
 }

examples/called-on-contract/package.json

@@ -19,7 +19,7 @@
     "mocha": "^7.1.2",
     "ts-node": "^8.9.1",
     "typescript": "^4.6.2",
-    "@openzeppelin/contracts": "^3.4.2"
+    "@openzeppelin/contracts": "^4.9.2"
   },
   "private": true
 }

examples/typechain-example/package.json

@@ -10,7 +10,7 @@
     "lint:fix": "eslint --fix '{src,test}/**/*.ts'"
   },
   "devDependencies": {
-    "@openzeppelin/contracts": "^3.0.0",
+    "@openzeppelin/contracts": "^4.9.2",
     "@types/chai": "^4.2.3",
     "@types/mocha": "^5.2.7",
     "chai": "^4.2.0",