Bump @openzeppelin/contracts from 4.4.2 to 4.9.2 in /examples/truffle

Bumps [@openzeppelin/contracts](https://github.com/OpenZeppelin/openzeppelin-contracts) from 4.4.2 to 4.9.2.
- [Release notes](https://github.com/OpenZeppelin/openzeppelin-contracts/releases)
- [Changelog](https://github.com/OpenZeppelin/openzeppelin-contracts/blob/v4.9.2/CHANGELOG.md)
- [Commits](OpenZeppelin/openzeppelin-contracts@v4.4.2...v4.9.2)

---
updated-dependencies:
- dependency-name: "@openzeppelin/contracts"
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

examples/truffle/package.json

@@ -23,7 +23,7 @@
   "homepage": "https://github.com/gnosis/ethcontract-rs",
   "devDependencies": {
     "@gnosis.pm/util-contracts": "^3.0.1",
-    "@openzeppelin/contracts": "^4.4.2",
+    "@openzeppelin/contracts": "^4.9.2",
     "@truffle/hdwallet-provider": "^2.0.0",
     "truffle": "^5.4.29",
     "truffle-plugin-verify": "^0.5.20"

examples/truffle/yarn.lock

@@ -571,10 +571,10 @@
   resolved "https://registry.yarnpkg.com/@nodefactory/filsnap-types/-/filsnap-types-0.2.2.tgz#f95cbf93ce5815d8d151c60663940086b015cb8f"
   integrity sha512-XT1tE2vrYF2D0tSNNekgjqKRpqPQn4W72eKul9dDCul/8ykouhqnVTyjFHYvBhlBWE0PK3nmG7i83QvhgGSiMw==
 
-"@openzeppelin/contracts@^4.4.2":
-  version "4.4.2"
-  resolved "https://registry.yarnpkg.com/@openzeppelin/contracts/-/contracts-4.4.2.tgz#4e889c9c66e736f7de189a53f8ba5b8d789425c2"
-  integrity sha512-NyJV7sJgoGYqbtNUWgzzOGW4T6rR19FmX1IJgXGdapGPWsuMelGJn9h03nos0iqfforCbCB0iYIR0MtIuIFLLw==
+"@openzeppelin/contracts@^4.9.2":
+  version "4.9.2"
+  resolved "https://registry.yarnpkg.com/@openzeppelin/contracts/-/contracts-4.9.2.tgz#1cb2d5e4d3360141a17dbc45094a8cad6aac16c1"
+  integrity sha512-mO+y6JaqXjWeMh9glYVzVu8HYPGknAAnWyxTRhGeckOruyXQMNnlcW6w/Dx9ftLeIQk6N+ZJFuVmTwF7lEIFrg==
 
 "@protobufjs/aspromise@^1.1.1", "@protobufjs/aspromise@^1.1.2":
   version "1.1.2"