chore(deps): bump keyring from 3.6.2 to 3.6.3 in /backend

Bumps [keyring](https://github.com/hwchen/keyring-rs) from 3.6.2 to 3.6.3.
- [Release notes](https://github.com/hwchen/keyring-rs/releases)
- [Changelog](https://github.com/open-source-cooperative/keyring-rs/blob/main/CHANGELOG.md)
- [Commits](open-source-cooperative/keyring-rs@v3.6.2...v3.6.3)

---
updated-dependencies:
- dependency-name: keyring
  dependency-version: 3.6.3
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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Author: dependabot[bot]