Bump the rust-dependencies group across 1 directory with 2 updates

[dependabot]

Bumps the rust-dependencies group with 2 updates in the /rust directory: rand and thiserror.

Updates rand from 0.10.2 to 0.10.3

Changelog

Sourced from rand's changelog.

[0.10.3] — 2026-09-20

Fixes

• Fix WeightedIndex panic when the sum of float weights is infinite; return Error::Overflow instead (#1808)
• Fix spurious Error::NonFinite from Uniform::new_inclusive on large finite float ranges such as 0.0..=f64::MAX (#1821)
• Fix possible panic due to sampling a deserialized Uniform<char> (#1831)

Changes

• Report exact remaining lengths from WeightedIndex::weights() and reduce overhead when reading weights (#1838)

#1808: rust-random/rand#1808 #1821: rust-random/rand#1821 #1831: rust-random/rand#1831 #1838: rust-random/rand#1838

Commits

• 9e7d328 Prepare rand 0.10.3 (#1840)
• f73ce74 Optimize WeightedIndex weight lookup and iteration (#1838)
• ef9e044 Avoid panic from deserialized Uniform\<char> where range == 0 (#1831)
• c994eb1 docs: fix angle unit in quick start example (#1839)
• 33dea4f Test that WeightedIndex rejects INFINITY with Error::Overflow (#1822)
• 94c9078 Fix Uniform::new_inclusive overflow on large finite float ranges (#1821)
• bb1262f Use Xoshiro256PlusPlus in examples/rayon-monte-carlo.rs (#1805)
• 521fab6 Stop pinning dependencies (#1820)
• 3f7c433 Stop pinning dependencies
• cf4f73e sample_efraimidis_spirakis: error on more than amount non-finite weights (#1814)
• Additional commits viewable in compare view

Updates thiserror from 2.0.20 to 2.0.21

Release notes

Sourced from thiserror's releases.

2.0.21

• Fix parsing of generic unit variants in display expressions (#459)

Commits

• b1827ee Release 2.0.21
• 58037b5 Merge pull request #459 from dtolnay/turbofish
• f82a0cf Keep track of nested turbofish depth
• 72ea492 Raise required compiler to Rust 1.77
• 72eea0d Resolve io_other_error clippy lint in tests
• 07f09a2 Raise required compiler to Rust 1.74
• 2715388 Update ui test suite to nightly-2026-09-22
• 5a306c7 Update ui test suite to nightly-2026-09-05
• ef9383b Update ui test suite to nightly-2026-08-22
• 8336b84 Update ui tests for version 2.0.20
• See full diff in compare view

[dependabot]

Looks like these dependencies are updatable in another way, so this is no longer needed.