Bump @openzeppelin/contracts-upgradeable from 4.8.0-rc.1 to 4.9.6 (#222)

Bumps [@openzeppelin/contracts-upgradeable](https://github.com/OpenZeppelin/openzeppelin-contracts-upgradeable) from 4.8.0-rc.1 to 4.9.6.
- [Release notes](https://github.com/OpenZeppelin/openzeppelin-contracts-upgradeable/releases)
- [Changelog](https://github.com/OpenZeppelin/openzeppelin-contracts-upgradeable/blob/master/CHANGELOG.md)
- [Commits](OpenZeppelin/openzeppelin-contracts-upgradeable@v4.8.0-rc.1...v4.9.6)

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

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