Bump siphasher from 0.3.1 to 0.3.7 in /consensus/enclave/trusted (#942)

Bumps [siphasher](https://github.com/jedisct1/rust-siphash) from 0.3.1 to 0.3.7.
- [Release notes](https://github.com/jedisct1/rust-siphash/releases)
- [Commits](jedisct1/rust-siphash@0.3.1...0.3.7)

---
updated-dependencies:
- dependency-name: siphasher
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

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