[Security] Bump smallvec from 0.6.2 to 0.6.3

[dependabot-preview[bot]]

Bumps smallvec from 0.6.2 to 0.6.3. This update includes security fixes.

Vulnerabilities fixed

*Sourced from [The RustSec Advisory Database](https://github.com/RustSec/advisory-db/blob/master/crates/smallvec/RUSTSEC-2018-0003.toml).* > **Possible double free during unwinding in SmallVec::insert_many** > If an iterator passed to `SmallVec::insert_many` panicked in `Iterator::next`, > destructors were run during unwinding while the vector was in an inconsistent > state, possibly causing a double free (a destructor running on two copies of > the same value). > > This is fixed in smallvec 0.6.3 by ensuring that the vector's length is not > updated to include moved items until they have been removed from their > original positions. Items may now be leaked if `Iterator::next` panics, but > they will not be dropped more than once. > > ... (truncated) > > Patched versions: >= 0.6.3; ^0.3.4; ^0.4.5; ^0.5.1 > Unaffected versions: < 0.3.2 *Sourced from [The RustSec Advisory Database](https://github.com/RustSec/advisory-db/blob/master/crates/smallvec/RUSTSEC-0000-0000.toml).* > **Possible double free during unwinding in SmallVec::insert_many** > If an iterator passed to `SmallVec::insert_many` panicked in `Iterator::next`, > destructors were run during unwinding while the vector was in an inconsistent > state, possibly causing a double free (a destructor running on two copies of > the same value). > > This is fixed in smallvec 0.6.3 by ensuring that the vector's length is not > updated to include moved items until they have been removed from their > original positions. Items may now be leaked if `Iterator::next` panics, but > they will not be dropped more than once. > > ... (truncated) > > Patched versions: >= 0.6.3 > Unaffected versions: < 0.3.2

Release notes

*Sourced from [smallvec's releases](https://github.com/servo/rust-smallvec/releases).* > ## v0.6.3 > * Fix possible double-free in `insert_many` when passed an iterator that panics in `next` ([#103](https://github-redirect.dependabot.com/servo/rust-smallvec/issues/103)) > * Add a new `union` feature (disabled by default) that reduces the size of the SmallVec struct ([#94](https://github-redirect.dependabot.com/servo/rust-smallvec/issues/94)) > * Improve performance of `extend` and `from_elem` ([#93](https://github-redirect.dependabot.com/servo/rust-smallvec/issues/93)) > * Improve performance of `drop` ([#100](https://github-redirect.dependabot.com/servo/rust-smallvec/issues/100)) > * Update to build without `std` feature on current Rust nightly ([#104](https://github-redirect.dependabot.com/servo/rust-smallvec/issues/104)) > * Additional benchmarks ([#95](https://github-redirect.dependabot.com/servo/rust-smallvec/issues/95), [#97](https://github-redirect.dependabot.com/servo/rust-smallvec/issues/97)) > * Update dev-dependency on `bincode` ([#102](https://github-redirect.dependabot.com/servo/rust-smallvec/issues/102))

Commits

- [`fcb1b7e`](https://github.com/servo/rust-smallvec/commit/fcb1b7e99a2a98d928983af78a494ef566cbde8b) Auto merge of [#105](https://github-redirect.dependabot.com/servo/rust-smallvec/issues/105) - mbrubeck:bump, r=jdm - [`6fee1b0`](https://github.com/servo/rust-smallvec/commit/6fee1b05b90c959ed4edbd5f86c336e645f6898a) Version 0.6.3 - [`8fd2b9b`](https://github.com/servo/rust-smallvec/commit/8fd2b9b2413967509715539783e97f6d8c531efc) Auto merge of [#103](https://github-redirect.dependabot.com/servo/rust-smallvec/issues/103) - mbrubeck:panic, r=jdm - [`5a8ab46`](https://github.com/servo/rust-smallvec/commit/5a8ab468640b41b9643bd3adc43ae64d42096eb9) Auto merge of [#104](https://github-redirect.dependabot.com/servo/rust-smallvec/issues/104) - mbrubeck:alloc, r=jdm - [`a18a427`](https://github.com/servo/rust-smallvec/commit/a18a427c5308f21e268950e1c07040df90cf5f05) Update to build in no_std mode on latest Rust nightly - [`1f40252`](https://github.com/servo/rust-smallvec/commit/1f4025218c4321ea42ad01d80dd6110def2d86d9) Make from_elem panic-safe - [`26b2490`](https://github.com/servo/rust-smallvec/commit/26b249075930b46cfafc70b1d18fd0cb35fd2314) Make insert_many panic-safe - [`bfdd7ee`](https://github.com/servo/rust-smallvec/commit/bfdd7eed5e1171585919e141ae0d74a6fd32bc51) Auto merge of [#102](https://github-redirect.dependabot.com/servo/rust-smallvec/issues/102) - bcko:patch-1, r=mbrubeck - [`11e2927`](https://github.com/servo/rust-smallvec/commit/11e292739682c01cbc19cc7f58d4b961712c65a1) bincode="0.8" -> bincode="1.0.1" - [`d88b2d9`](https://github.com/servo/rust-smallvec/commit/d88b2d98e3c907d2c009b5e6e4a81fac72353796) Auto merge of [#100](https://github-redirect.dependabot.com/servo/rust-smallvec/issues/100) - mbrubeck:drop, r=SimonSapin - Additional commits viewable in [compare view](https://github.com/servo/rust-smallvec/compare/v0.6.2...v0.6.3)

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[dependabot-preview[bot]]

Looks like smallvec is up-to-date now, so this is no longer needed.