Bump smallvec from 1.2.0 to 1.4.0

[dependabot-preview[bot]]

Bumps smallvec from 1.2.0 to 1.4.0.

Release notes

Sourced from smallvec's releases.

v1.4.0

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

v1.3.0

• 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.

Commits

• 78c2528 Auto merge of #214 - servo:try_reserve, r=nox
• 3ec778f Early returns
• bdfc429 Use realloc when possible
• 62a3622 Add try_reserve and friends
• 40fa827 Stop using Vec as an allocator
• 6c76c41 Auto merge of #212 - mbrubeck:fuzz, r=jdm
• b59a5c4 Ignore fuzz target directory
• 2cee1e8 Pin honggfuzz to 0.5.47
• 62ce124 Auto merge of #209 - RalfJung:miri, r=mbrubeck
• cbe3620 note the leak in insert_many docs
• Additional commits viewable in compare view

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[dependabot-preview[bot]]

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