deps: update rust crate smol_str to 0.3

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
smol_str	dependencies	minor	0.1 -> 0.3

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Release Notes

rust-analyzer/smol_str (smol_str)

v0.3.2

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• Fix SmolStrBuilder::push incorrectly padding null bytes when spilling onto the heap on a
  multibyte character push

v0.3.1

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• Fix SmolStrBuilder leaking implementation details

v0.3.0

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• Remove deprecated SmolStr::new_inline_from_ascii function
• Remove SmolStr::to_string in favor of ToString::to_string
• Add impl AsRef<[u8]> for SmolStr impl
• Add impl AsRef<OsStr> for SmolStr impl
• Add impl AsRef<Path> for SmolStr impl
• Add SmolStrBuilder

v0.2.2

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• Add StrExt trait providing to_lowercase_smolstr, replace_smolstr and similar
• Add PartialEq optimization for ptr_eq-able representations

v0.2.1

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v0.2.0

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v0.1.25

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v0.1.24

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v0.1.23

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v0.1.22

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v0.1.21

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v0.1.20

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v0.1.19

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