Add Member Updating to API

[seesjays]

What type of PR is this? (check applicable) 🚧

• [ ] ♻️ Refactor
• [X] ✨ Feature
• [ ] 🐛 Bug Fix
• [ ] 👷 Optimization
• [ ] 📝 Documentation Update
• [ ] 🔖 Release
• [ ] 🚩 Other

Describe your PR request 🔥 Adds an endpoint to the Next API for updating a member's info with a PUT request to /api/members

Related Issues 🩹 Closes #38

Additional context 🗒️ Will be used in a later PR to make the member update modal actually update members.