build(deps): update rust crate convert_case to 0.12.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
convert_case	dependencies	minor	0.11.0 → 0.12.0

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Release Notes

rutrum/convert-case (convert_case)

v0.12.0

Compare Source

This release improves speed and memory efficiency. A couple techniques were used:

• Character case checks first check ascii before doing the more expensive grapheme checks (which require heap allocations).
• Delimiter only splits get a dedicated path in the split method.
• The case of characters is computed upfront in a bitmask before checking individual boundary conditions in split. Built-in boundaries get a custom implementation built on top of this bitmask.

Benchmark	Before	After	Improvement
snake_short ("hello_world")	412 ns	21.3 ns	−95%
lower_upper ("lowerUpperUpper")	1,631 ns	475 ns	−71%
acronym ("XMLRequest")	1,108 ns	418 ns	−62%
camel_set ("getTotalLength3D")	3,844 ns	643 ns	−83%
defaults_mixed (9 boundaries)	8,083 ns	1,500 ns	−81%
defaults_long_snake (265 chars)	52,281 ns	4,730 ns	−91%
unicode_cyrillic ("ПЕРСПЕКТИВА24")	8,334 ns	741 ns	−91%
Full pipeline from_to_all (4 words x 14 x 14)	1,230 µs	263 µs	−79%

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