fix(deps): update rust crate rand_core_ristretto to 0.6.4

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This PR contains the following updates:

Package	Type	Update	Change
rand_core_ristretto (source)	dependencies	minor	0.5.1 -> 0.6.4

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Release Notes

rust-random/rand

v0.6.4

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Fixes

• Move wasm-bindgen shims to correct crate (#​686)
• Make wasm32-unknown-unknown compile but fail at run-time if missing bindingsg (#​686)

v0.6.3

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Fixes

• Make the std feature require the optional rand_os dependency (#​675)
• Re-export the optional WASM dependencies of rand_os from rand to avoid breakage (#​674)

v0.6.2

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Additions

• Add Default for ThreadRng (#​657)
• Move rngs::OsRng to rand_os sub-crate; clean up code; use as dependency (#​643) ##BLOCKER##
• Add rand_xoshiro sub-crate, plus benchmarks (#​642, #​668)

Fixes

• Fix bias in UniformInt::sample_single (#​662)
• Use autocfg instead of rustc_version for rustc version detection (#​664)
• Disable i128 and u128 if the target_os is emscripten (#​671: work-around Emscripten limitation)
• CI fixes (#​660, #​671)

Optimisations

• Optimise memory usage of UnitCircle and UnitSphereSurface distributions (no PR)

v0.6.1

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• Support sampling Duration also for no_std (only since Rust 1.25) (#​649)
• Disable default features of libc (#​647)

v0.6.0

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Project organisation

• Rand has moved from rust-lang-nursery
  to rust-random! (#​578)
• Created The Rust Random Book
  (source)
• Update copyright and licence notices (#​591, #​611)
• Migrate policy documentation from the wiki (#​544)

Platforms

• Add fork protection on Unix (#​466)
• Added support for wasm-bindgen. (#​541, #​559, #​562, #​600)
• Enable OsRng for powerpc64, sparc and sparc64 (#​609)
• Use syscall from libc on Linux instead of redefining it (#​629)

RNGs

• Switch SmallRng to use PCG (#​623)
• Implement Pcg32 and Pcg64Mcg generators (#​632)
• Move ISAAC RNGs to a dedicated crate (#​551)
• Move Xorshift RNG to its own crate (#​557)
• Move ChaCha and HC128 RNGs to dedicated crates (#​607, #​636)
• Remove usage of Rc from ThreadRng (#​615)

Sampling and distributions

• Implement Rng.gen_ratio() and Bernoulli::new_ratio() (#​491)
• Make Uniform strictly respect f32 / f64 high/low bounds (#​477)
• Allow gen_range and Uniform to work on non-Copy types (#​506)
• Uniform supports inclusive ranges: Uniform::from(a..=b). This is
  automatically enabled for Rust >= 1.27. (#​566)
• Implement TrustedLen and FusedIterator for DistIter (#​620)

New distributions

• Add the Dirichlet distribution (#​485)
• Added sampling from the unit sphere and circle. (#​567)
• Implement the triangular distribution (#​575)
• Implement the Weibull distribution (#​576)
• Implement the Beta distribution (#​574)

Optimisations

• Optimise Bernoulli::new (#​500)
• Optimise char sampling (#​519)
• Optimise sampling of std::time::Duration (#​583)

Sequences

• Redesign the seq module (#​483, #​515)
• Add WeightedIndex and choose_weighted (#​518, #​547)
• Optimised and changed return type of the sample_indices function. (#​479)
• Use Iterator::size_hint() to speed up IteratorRandom::choose (#​593)

SIMD

• Support for generating SIMD types (#​523, #​542, #​561, #​630)

Other

• Revise CI scripts (#​632, #​635)
• Remove functionality already deprecated in 0.5 (#​499)
• Support for i128 and u128 is automatically enabled for Rust >= 1.26. This
  renders the i128_support feature obsolete. It still exists for backwards
  compatibility but does not have any effect. This breaks programs using Rand
  with i128_support on nightlies older than Rust 1.26. (#​571)

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