Update Rust crate smallvec to v1.6.1 [SECURITY]

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
smallvec	dependencies	minor	1.0.0 -> 1.6.1

GitHub Vulnerability Alerts

CVE-2021-25900

A bug in the SmallVec::insert_many method caused it to allocate a buffer that was smaller than needed. It then wrote past the end of the buffer, causing a buffer overflow and memory corruption on the heap. This bug was only triggered if the iterator passed to insert_many yielded more items than the lower bound returned from its size_hint method.

The flaw was corrected in smallvec 0.6.14 and 1.6.1, by ensuring that additional space is always reserved for each item inserted. The fix also simplified the implementation of insert_many to use less unsafe code, so it is easier to verify its correctness.

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Release Notes

servo/rust-smallvec (smallvec)

v1.6.1

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• Fix a possible buffer overflow in insert_many (#​252, #​254).

v1.6.0

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• The "union" feature is now compatible with stable Rust 1.49 (#​248, #​247).
• Fixed warnings when compiling with Rust 1.51 nightly (#​242, #​246).

v1.5.1

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• Improve performance of push (#​241).

v1.5.0

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• Add the append method (#​237).
• Add support for more array sizes between 17 and 31 (#​234).
• Don't panic on deserialization errors (#​238).

v1.4.2

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• insert_many no longer leaks elements if the provided iterator panics (#​213).
• The unstable const_generics and specialization features are updated to work with the most recent nightly Rust toolchain (#​232).
• Internal code cleanup (#​229, #​231).

v1.4.1

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• Don't allocate when the size of the element type is zero. Allocating zero bytes is undefined behavior. (#​228)

v1.4.0

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• Add try_reserve, try_reserve_exact, and try_grow methods (#​214).

v1.3.0

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• Add a new unstable const_generics feature (#​204).
• Improve inlining of constructor functions (#​206).
• Add a slice.to_smallvec() convenience method (#​203).
• Documentation and testing improvements.

v1.2.0

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• IntoIter now implements Debug (#​196).
• smallvec! macro is now easier to use in no_std contexts where the vec! macro isn't automatically imported (#​198).

v1.1.0

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• Added new method SmallVec::into_boxed_slice (#​190).
• Added new methods IntoIter::as_slice and as_mut_slice (#​182).
• IntoIter now implements Clone (#​192).
• Improved documentation and testing (#​186, #​189, #​193).
• Minor code cleanups (#​176).

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