Update dependencies: oneio 0.21 and bgpkit-broker 0.11

[digizeph]

This PR updates two dependencies to their latest versions:

oneio 0.21

Breaking change addressed:

• oneio::download() no longer accepts the third Option<reqwest::blocking::Client> parameter
• Updated examples/parse_single_file_parallel.rs and benches/data_source.rs to use the new signature

Other changes in oneio 0.21 (no impact on bgpkit-parser):

• OneIoError is now #[non_exhaustive]
• New OneIo and OneIoBuilder APIs for reusable clients
• Various builder methods for headers, timeouts, proxy, certificates
• Improved S3 and download functionality
• CLI improvements (progress bars, custom headers)

bgpkit-broker 0.11

Updated dev dependency from 0.10.1 to 0.11.

---

Both updates maintain backward compatibility for the public API surface that bgpkit-parser uses. All tests pass and clippy is clean.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.70%. Comparing base (da6b8dd) to head (bc989db).
⚠️ Report is 7 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #276   +/-   ##
=======================================
  Coverage   90.70%   90.70%           
=======================================
  Files          84       84           
  Lines       15496    15496           
=======================================
  Hits        14056    14056           
  Misses       1440     1440           

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