deps: update rust crate smol_str to 0.3

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
smol_str (source)	dependencies	minor	0.1 → 0.3

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Release Notes

rust-lang/rust-analyzer (smol_str)

v0.3.4

• Added rust-version field to Cargo.toml

v0.3.3

• Optimise StrExt::to_ascii_lowercase_smolstr, StrExt::to_ascii_uppercase_smolstr
  ~2x speedup inline, ~4-22x for heap.
• Optimise StrExt::to_lowercase_smolstr, StrExt::to_uppercase_smolstr ~2x speedup inline, ~5-50x for heap.
• Optimise StrExt::replace_smolstr, StrExt::replacen_smolstr for single ascii replace,
  ~3x speedup inline & heap.

v0.3.2

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

v0.3.1

• Fix SmolStrBuilder leaking implementation details

v0.3.0

• 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

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

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