build(deps-dev): bump dotenv from 16.5.0 to 16.6.0 in /multisig

Bumps [dotenv](https://github.com/motdotla/dotenv) from 16.5.0 to 16.6.0.
- [Changelog](https://github.com/motdotla/dotenv/blob/master/CHANGELOG.md)
- [Commits](motdotla/dotenv@v16.5.0...v16.6.0)

---
updated-dependencies:
- dependency-name: dotenv
  dependency-version: 16.6.0
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

multisig/package-lock.json

@@ -14,7 +14,7 @@
     "@types/chai": "^5.2.2",
     "@types/mocha": "^10.0.10",
     "chai": "^5.2.0",
-    "dotenv": "^16.5.0",
+    "dotenv": "^16.6.0",
     "mocha": "^11.7.1",
     "prettier": "^3.6.1",
     "ts-mocha": "^11.1.0",