Bump alloy from 0.11.1 to 0.12.6 in /rust

Bumps [alloy](https://github.com/alloy-rs/alloy) from 0.11.1 to 0.12.6.
- [Release notes](https://github.com/alloy-rs/alloy/releases)
- [Changelog](https://github.com/alloy-rs/alloy/blob/main/CHANGELOG.md)
- [Commits](alloy-rs/alloy@v0.11.1...v0.12.6)

---
updated-dependencies:
- dependency-name: alloy
  dependency-version: 0.12.6
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]