chore(deps-dev): bump ethers from 5.7.2 to 6.12.1

Bumps [ethers](https://github.com/ethers-io/ethers.js) from 5.7.2 to 6.12.1.
- [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@v5.7.2...v6.12.1)

---
updated-dependencies:
- dependency-name: ethers
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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

packages/protocol/package.json

@@ -29,7 +29,7 @@
     "eslint-plugin-node": "^11.1.0",
     "eslint-plugin-prettier": "^5.1.3",
     "eslint-plugin-promise": "^6.1.1",
-    "ethers": "^5.7.2",
+    "ethers": "^6.12.1",
     "solc": "0.8.24",
     "solhint": "^4.5.4",
     "ts-node": "^10.9.2",

packages/supplementary-contracts/package.json

@@ -21,7 +21,7 @@
     "eslint-plugin-node": "^11.1.0",
     "eslint-plugin-prettier": "^5.1.3",
     "eslint-plugin-promise": "^6.1.1",
-    "ethers": "^5.7.2",
+    "ethers": "^6.12.1",
     "solc": "0.8.24",
     "solhint": "^4.5.4",
     "ts-node": "^10.9.2",

packages/taikoon/package.json

@@ -26,7 +26,7 @@
     "eslint-plugin-node": "^11.1.0",
     "eslint-plugin-prettier": "^5.1.3",
     "eslint-plugin-promise": "^6.1.1",
-    "ethers": "^5.7.2",
+    "ethers": "^6.12.1",
     "solc": "0.8.24",
     "solhint": "^4.5.4",
     "ts-node": "^10.9.2",