Bump smallvec from 1.8.0 to 1.9.0

[dependabot[bot]]

Bumps smallvec from 1.8.0 to 1.9.0.

Release notes

Sourced from smallvec's releases.

v1.9.0

• Add retain_mut as an alias for retain, for compatibility with std::vec::Vec (#283).

v1.8.1

• Optimize inserts at the end of the vector (#282).
• Fix possible aliasing issues with raw pointers (#277).
• Fix format of license field in Cargo manifest (#278).

Commits

• 7fa951f Version 1.9.0
• e9c2f0a Add retain_mut method (as an alias to retain)
• 4ce5e16 Version 1.8.1
• 7f9e513 Add a benchmark for the insert case where index == len.
• b233568 Optimize insert for the case where index == len.
• bb8def4 Use SPDX license format (#278)
• 8363ea8 Auto merge of #277 - saethlin:fix-aliasing, r=mbrubeck
• ecd69b9
• b257aad Fix Miri complaints with -Zmiri-tag-raw-pointers
• See full diff in compare view

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