Bump ethers from 6.15.0 to 6.16.0 in the blockchain group

Bumps the blockchain group with 1 update: [ethers](https://github.com/ethers-io/ethers.js).


Updates `ethers` from 6.15.0 to 6.16.0
- [Release notes](https://github.com/ethers-io/ethers.js/releases)
- [Changelog](https://github.com/ethers-io/ethers.js/blob/main/CHANGELOG.md)
- [Commits](ethers-io/ethers.js@v6.15.0...v6.16.0)

---
updated-dependencies:
- dependency-name: ethers
  dependency-version: 6.16.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: blockchain
...

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

Author: dependabot[bot]