Update rand_os requirement from 0.1 to 0.2 in /rust

[dependabot[bot]]

Updates the requirements on rand_os to permit the latest version.

Commits

• c388cb2 Merge pull request #873 from dhardy/master
• a622ea3 Fixes regarding OsRng move
• d877ed5 Merge pull request #864 from dhardy/error
• 3b79aaa Merge branch 'master' into error
• a4cd495 Merge pull request #856 from taiki-e/alloc
• 918765d Apply requested changes
• 3b038a5 Remove #![feature(alloc)]
• df0c772 Reconstruct io::Error from raw code if possible in From impl
• 2f9e9b2 Update rand_core and rand_jitter versions
• 73251d5 Update rand_core::Error in line with getrandom::Error
• Additional commits viewable in compare view

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