Bump ethers from 6.15.0 to 6.16.0

Bumps [ethers](https://github.com/ethers-io/ethers.js) 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:development
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

package-lock.json

@@ -22,7 +22,7 @@
     "eslint-plugin-prettier": "^5.5.4",
     "eslint-plugin-promise": "^7.2.1",
     "ethereum-waffle": "^4.0.10",
-    "ethers": "^6.15.0",
+    "ethers": "^6.16.0",
     "hardhat": "^2.27.1",
     "hardhat-gas-reporter": "^2.2.3",
     "prettier": "^3.7.4",