chore(deps): update rust crate libfuzzer-sys to v0.4.13

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
libfuzzer-sys	dependencies	patch	0.4.12 → 0.4.13

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Release Notes

rust-fuzz/libfuzzer (libfuzzer-sys)

v0.4.13

Compare Source

Released 2026-06-04.

Changed

• Updated docs for the fuzz_mutator! macro to link to the mutatis
  crate, which is a helpful crate when writing complex
  custom mutators.

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🤖 Augment PR Summary

Summary: Updates the fuzzing dependency libfuzzer-sys from 0.4.12 to 0.4.13 by refreshing the fuzz/Cargo.lock lockfile.

Notes: This PR appears to be lockfile-only (no application/library code changes), picking up upstream maintenance/doc updates while keeping the fuzz target dependency set current.

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