chore(deps): bump ujson from 5.11.0 to 5.12.0 in /backend

[dependabot]

Bumps ujson from 5.11.0 to 5.12.0.

Release notes

Sourced from ujson's releases.

5.12.0

Added

• Update license field (#693) @​wagenrace
• Build wheels for GraalPy (#685) @​timfel

Changed

• Drop support for Python 3.9 (#686) @​hugovk

Fixed

• Fix memory leak parsing large integers (ultrajson/ultrajson@4baeb95) @​bwoodsend
• Fix buffer overflow/infinite loop from indent handling (#709) @​bwoodsend
• Remove upper bound of setuptools for PyPy (#704) @​hugovk

Commits

• 4baeb95 Fix memory leak parsing large integers
• 486bd45 Fix buffer overflow/infinite loop from indent handling
• a465ed7 Add leak detection to tests
• 32ebf66 Remove upper bound of setuptools for PyPy (#704)
• 6bf41bd Remove upper bound of setuptools for PyPy
• 4a4fd73 chore(deps): update github-actions
• d708b05 Add security policy (#699)
• 3d66f4d Add security policy
• 8f23cce [pre-commit.ci] pre-commit autoupdate (#698)
• 2696fc3 [pre-commit.ci] pre-commit autoupdate
• Additional commits viewable in compare view

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[dependabot]

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[coderanik]

Superseded by PR #38, which upgrades ujson to 5.12.1 because 5.12.0 remains affected by CVE-2026-44660.

[dependabot]

OK, I won't notify you again about this release, but will get in touch when a new version is available. If you'd rather skip all updates until the next major or minor version, let me know by commenting @dependabot ignore this major version or @dependabot ignore this minor version. You can also ignore all major, minor, or patch releases for a dependency by adding an ignore condition with the desired update_types to your config file.

If you change your mind, just re-open this PR and I'll resolve any conflicts on it.