[PR #12152/c1981efd backport][3.14] docs: replace deprecated ujson with orjson in client quickstart

[patchback]

This is a backport of PR #12152 as merged into master (c1981ef).

Fixes #10795.

The ujson library has been placed in maintenance-only mode. Its own maintainers now recommend migrating to orjson (source):

UltraJSON's architecture is fundamentally ill-suited to making changes without risk of introducing new security vulnerabilities. Users are encouraged to migrate to orjson which is both much faster and less likely to introduce a surprise buffer overflow vulnerability in the future.

Changes

docs/client_quickstart.rst: Replaced the ujson code example with orjson. Since orjson.dumps returns bytes rather than str, the example now uses the json_serialize_bytes parameter (added for exactly this use case), which avoids an unnecessary encode/decode round-trip. Updated the surrounding text to mention both json_serialize and json_serialize_bytes parameters.

CHANGES/10795.doc.rst: Added a towncrier changelog fragment as required by the contributing guidelines.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.25%. Comparing base (f438791) to head (0492061).
⚠️ Report is 4 commits behind head on 3.14.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##             3.14   #12162      +/-   ##
==========================================
- Coverage   98.26%   98.25%   -0.01%     
==========================================
  Files         129      129              
  Lines       45678    45678              
  Branches     2473     2473              
==========================================
- Hits        44884    44881       -3     
- Misses        612      615       +3     
  Partials      182      182              

Flag	Coverage Δ
CI-GHA	98.13% <ø> (-0.01%)	⬇️
OS-Linux	97.89% <ø> (-0.01%)	⬇️
OS-Windows	95.63% <ø> (ø)
OS-macOS	97.16% <ø> (ø)
Py-3.10.11	96.70% <ø> (ø)
Py-3.10.19	97.18% <ø> (-0.01%)	⬇️
Py-3.11.14	97.41% <ø> (ø)
Py-3.11.9	96.94% <ø> (ø)
Py-3.12.10	97.02% <ø> (ø)
Py-3.12.12	97.50% <ø> (ø)
Py-3.13.12	97.72% <ø> (-0.01%)	⬇️
Py-3.14.3	97.68% <ø> (ø)
Py-3.14.3t	96.79% <ø> (ø)
Py-pypy3.11.13-7.3.20	96.82% <ø> (-0.01%)	⬇️
VM-macos	97.16% <ø> (ø)
VM-ubuntu	97.89% <ø> (-0.01%)	⬇️
VM-windows	95.63% <ø> (ø)

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[codspeed-hq]

Merging this PR will not alter performance

✅ 59 untouched benchmarks

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_{Comparing patchback/backports/3.14/c1981efd5f751b95f3569e956b6ee91f314aa7cb/pr-12152 (0492061) with 3.14 (f438791)¹}

Footnotes

1. No successful run was found on 3.14 (3c7f1d6) during the generation of this report, so f438791 was used instead as the comparison base. There might be some changes unrelated to this pull request in this report. ↩