Update castaway requirement from 0.1.1 to 0.2.3

[dependabot[bot]]

Updates the requirements on castaway to permit the latest version.

Release notes

Sourced from castaway's releases.

0.2.3

Added

• Enable certain implementations of LifetimeFree for no_std when alloc is available based on alloc feature. @​dragazo in sagebind/castaway#13
• Implement LifetimeFree for tuples. @​sagebind in sagebind/castaway#17

Fixed

• More robust type_eq_non_static implementation. @​dtolnay in sagebind/castaway#14
• Fix macos CI builds. @​sagebind in sagebind/castaway#15
• Fix miscompilation in transmute_unchecked introduced by bug in LLVM. @​zheland in sagebind/castaway#25

Full Changelog: https://github.com/sagebind/castaway/compare/0.2.2...0.2.3

Commits

• 7231cf5 Bump rustversion from 1.0.15 to 1.0.17
• c1b43ef Bump paste from 1.0.14 to 1.0.15 (#21)
• b1dd604 Enable auto-merge
• ca92404 Update CI config (#26)
• f397e48 Fix miscompilation in transmute_unchecked introduced by bug in LLVM (#25)
• 7e15c46 Bump rustversion from 1.0.14 to 1.0.15 (#19)
• 564b11f allow no-std but alloc (#13)
• 437fbda Implement LifetimeFree for tuples (#17)
• 83ae3fa Prepare 0.2.3 release
• d122367 Bump checkout version in release workflow
• Additional commits viewable in compare view

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