Bump the cargo group across 1 directory with 2 updates (#398)

Bumps the cargo group with 2 updates in the /old-backend directory: [rsa](https://github.com/RustCrypto/RSA) and [quinn-proto](https://github.com/quinn-rs/quinn).


Updates `rsa` from 0.9.6 to 0.9.7
- [Changelog](https://github.com/RustCrypto/RSA/blob/v0.9.7/CHANGELOG.md)
- [Commits](RustCrypto/RSA@v0.9.6...v0.9.7)

Updates `quinn-proto` from 0.11.6 to 0.11.9
- [Release notes](https://github.com/quinn-rs/quinn/releases)
- [Commits](quinn-rs/quinn@quinn-proto-0.11.6...quinn-proto-0.11.9)

---
updated-dependencies:
- dependency-name: rsa
  dependency-type: indirect
  dependency-group: cargo
- dependency-name: quinn-proto
  dependency-type: indirect
  dependency-group: cargo
...

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