fix(deps): update rust crate rv to 0.19.0

[renovate-sh-app]

This PR contains the following updates:

Package	Type	Update	Change
rv	dependencies	minor	0.18.0 → 0.19.0

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Release Notes

promised-ai/rv (rv)

v0.19.1

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Added

• Derive PartialEq for NIX PosteriorParameters

v0.19.0

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Added

• Added product distributions expressible via tuples. (Note: Sufficient statistics are locked behind the experimental option since their behavior is not certain.)
• Added ScaledPrior and ShiftedPrior wrappers.

Changed

• Updated to Rust 2024 Edition
• Updated rand, rand_xoshiro, and rand_distr deps.
• Updated nalgebra.
• NormalInvChiSquared, NormalGamma, and NormalInvGamme PpCache for Gaussian conjugate analysis changed. ln_pp_with_cache is much faster.
• Gamma PpCache for Poisson conjugate analysis has been optimized. ln_pp_with_cache is faster.
• Fixed some typos.
• GitHub CI uses nightly since experimental features require nightly rust.
• OnceLock removed on distribution initialization in favor of uniform initialization cost over threads.
• Reworked extract_stat internals.
• CDVM was cleaned up, errors expanded, and parameters made more clear.
• Von Mises were sped up.
• LogSumExp was fixed when encountering -inf.
• NormalInvGamma::ln_pp was sped up.
• NIX PpCache was sped up by 20%.
• NiX Posterior predictive has its speed improved.

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