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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[github-actions]

GNU diffutils testsuite comparison:

Test results comparison:
  Current:   TOTAL: 33 / PASSED: 0 / FAILED: 33 / SKIPPED: 0
  Reference: TOTAL: 33 / PASSED: 8 / FAILED: 21 / SKIPPED: 4

Changes from main branch:
  TOTAL: +0
  PASSED: -8
  FAILED: +12

New test failures (12):
  - basic
  - bignum
  - brief-vs-stat-zero-kernel-lies
  - bug-64316
  - cmp
  - diff3
  - help-version
  - large-subopt
  - strcoll-0-names
  - strip-trailing-cr
  - timezone
  - y2038-vs-32bit