⬆️ Update ElectionGuard library dependency to 1.1.7

[rkorsak]

Issue

Closes #108
Closes #111

Description

Skipping 1.1.6 in favor of 1.1.7.
This updates the dependency and Postman samples.

Testing

Verify all tests pass.

Checklist

🚨Please review the guidelines for contributing to this repository.

• 🤔 CONSIDER adding a unit test if your PR resolves an issue.
• ✅ DO check open PR's to avoid duplicates.
• ✅ DO keep pull requests small so they can be easily reviewed.
• ✅ DO build locally before pushing.
• ✅ DO make sure tests pass.
• ✅ DO make sure any new changes are documented.
• ✅ DO make sure not to introduce any compiler warnings.
• ❌AVOID breaking the continuous integration build.
• ❌AVOID making significant changes to the overall architecture.

💙 Thank you!