chore(deps): bump quinn-proto from 0.11.10 to 0.11.14 in /backend

Bumps [quinn-proto](https://github.com/quinn-rs/quinn) from 0.11.10 to 0.11.14.
- [Release notes](https://github.com/quinn-rs/quinn/releases)
- [Commits](quinn-rs/quinn@quinn-proto-0.11.10...quinn-proto-0.11.14)

---
updated-dependencies:
- dependency-name: quinn-proto
  dependency-version: 0.11.14
  dependency-type: indirect
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]