Bump alloy-signer-local from 0.6.2 to 0.6.4

Bumps [alloy-signer-local](https://github.com/alloy-rs/alloy) from 0.6.2 to 0.6.4.
- [Release notes](https://github.com/alloy-rs/alloy/releases)
- [Changelog](https://github.com/alloy-rs/alloy/blob/main/CHANGELOG.md)
- [Commits](alloy-rs/alloy@v0.6.2...v0.6.4)

---
updated-dependencies:
- dependency-name: alloy-signer-local
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>