Bumps rand from 0.8.5 to 0.8.6.

Sourced from rand's changelog.

[0.8.6] - 2026-04-14

This release back-ports a fix from v0.10. See also #1763.

Changes

• Deprecate feature log (#1772)

#1763: rust-random/rand#1763 #1772: rust-random/rand#1772

• Drop the experimental simd_support feature.

• 5309f25 0.8.6 (#1772): update for recent nightly rustc and backport #1764
• 1126d03 When testing rustc 1.36, use compatible dependencies.
• 143b602 Add Cargo.lock.msrv.
• 9be86f2 Fix cross build test.
• 5e0d50d Drop simd_support.
• 8ff02f0 Upgrade cache action.
• 4ad0cc3 Don't test for unsupported target architecture.
• 258e6d0 Address warning.
• 9f0e676 Mark some internal traits as potentially unused.
• 6f123c1 Workaround never constructed and never used warning.
• Additional commits viewable in compare view

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