chore: bump dotenv in /examples/update-action-env-variables

Bumps [dotenv](https://github.com/motdotla/dotenv) from 16.3.1 to 17.3.1.
- [Changelog](https://github.com/motdotla/dotenv/blob/master/CHANGELOG.md)
- [Commits](motdotla/dotenv@v16.3.1...v17.3.1)

---
updated-dependencies:
- dependency-name: dotenv
  dependency-version: 17.3.1
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

examples/update-action-env-variables/package.json

@@ -10,6 +10,6 @@
   },
   "dependencies": {
     "@openzeppelin/defender-sdk": "1.15.0",
-    "dotenv": "^16.3.1"
+    "dotenv": "^17.3.1"
   }
 }