ci(rust): bump mlua from 0.12.1 to 0.12.2

[dependabot]

Bumps mlua from 0.12.1 to 0.12.2.

Release notes

Sourced from mlua's releases.

v0.12.2

What's Changed

• Luau updated to 0.740
• Added Value::weak_lua helper (#714)
• Added recursion_limit to SerializeOptions and DeserializeOptions (defaults to 128)
• Reject fractional numbers when converting to Rust integers on Lua 5.3+ and Luau
• Fix precision loss when comparing integer and floating point Values
• Table::equals now follows the backend's native __eq semantics
• Fix raw identifiers and callback types in derive macros
• Prevent scoped userdata and callbacks from outliving their scope during cleanup
• Fix panic and error handling in callbacks and userdata destructors to avoid corrupting Lua state
• Return errors on reference stack exhaustion and improve stack checks
• Fix async thread cancellation, stack cleanup, and global hook restoration when recycling threads
• Fix Luau require from chunks loaded by path (#735) and require context lifetimes
• perf: Reduce callback overhead
• perf: Improve serde performance

Full Changelog: mlua-rs/mlua@v0.12.1...v0.12.2

Changelog

Sourced from mlua's changelog.

v0.12.2 (Oct 03, 2026)

• Luau updated to 0.740
• Added Value::weak_lua helper (#714)
• Added recursion_limit to SerializeOptions and DeserializeOptions (defaults to 128)
• Reject fractional numbers when converting to Rust integers on Lua 5.3+ and Luau
• Fix precision loss when comparing integer and floating point Values
• Table::equals now follows the backend's native __eq semantics
• Fix raw identifiers and callback types in derive macros
• Prevent scoped userdata and callbacks from outliving their scope during cleanup
• Fix panic and error handling in callbacks and userdata destructors to avoid corrupting Lua state
• Return errors on reference stack exhaustion and improve stack checks
• Fix async thread cancellation, stack cleanup, and global hook restoration when recycling threads
• Fix Luau require from chunks loaded by path (#735) and require context lifetimes
• perf: Reduce callback overhead
• perf: Improve serde performance

Commits

• a186d46 v0.12.2
• 39d5863 Update CHANGELOG
• ee6fa80 Add Value::weak_lua helper
• 30b04f1 Update CHANGELOG
• a1781d5 Reduce callback overhead
• 68d9184 Optimize integer conversion from Luau numbers and strings
• e5230e3 Separate userdata type cache hits from map lookup
• 134af85 Reuse the table lock for metatable checks
• 6579794 Batch vector and array conversion from Lua tables
• 6a74d39 mlua_derive: allow lifetime parameters in userdata methods
• Additional commits viewable in compare view

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