chore(deps): bump lib/openzeppelin-contracts-upgradeable

Bumps [lib/openzeppelin-contracts-upgradeable](https://github.com/openzeppelin/openzeppelin-contracts-upgradeable) from `787138b` to `6568bed`.
- [Release notes](https://github.com/openzeppelin/openzeppelin-contracts-upgradeable/releases)
- [Commits](OpenZeppelin/openzeppelin-contracts-upgradeable@787138b...6568bed)

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

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Author: dependabot[bot]