Bump regex from 1.4.3 to 1.6.0 in /fuzz/storage-proof (#1507)

Bumps [regex](https://github.com/rust-lang/regex) from 1.4.3 to 1.6.0.
- [Release notes](https://github.com/rust-lang/regex/releases)
- [Changelog](https://github.com/rust-lang/regex/blob/master/CHANGELOG.md)
- [Commits](https://github.com/rust-lang/regex/compare/1.4.3...1.6.0

)

---
updated-dependencies:
- dependency-name: regex
  dependency-type: indirect
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>