Bump lib/openzeppelin-contracts from 659f306 to 448efee

Bumps [lib/openzeppelin-contracts](https://github.com/openzeppelin/openzeppelin-contracts) from `659f306` to `448efee`.
- [Release notes](https://github.com/openzeppelin/openzeppelin-contracts/releases)
- [Commits](OpenZeppelin/openzeppelin-contracts@659f306...448efee)

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

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