Update Rust crate yaml-merge-keys to 0.9.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
yaml-merge-keys	dependencies	minor	0.8.1 → 0.9.0

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Release Notes

utils/rust-yaml-merge-keys (yaml-merge-keys)

v0.9.0

Compare Source

• Remove serde_yml support.
  • Update saphyr to 0.0.12.
  • Bump MSRV to 1.85 (saphyr support uses Rust 2024).

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Benchmark for f7873c3

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Test	Base	PR	%
Reclass::inventory() multi-threaded	1370.7±90.87µs	1376.1±79.65µs	+0.39%
Reclass::inventory() single-threaded	2.5±0.02ms	2.5±0.03ms	0.00%