Fix unicode error

[AlexFrid]

What is the motivation?

Fixing a parse error with using unicode characters in strings.

Type of Change

• [ ] 📚 Examples / docs / tutorials / dependencies update
• [x] 🔧 Bug fix (non-breaking change which fixes an issue)
• [ ] 🥂 Improvement (non-breaking change which improves an existing feature)
• [ ] 🚀 New feature (non-breaking change which adds functionality)
• [ ] 💥 Breaking change (fix or feature that would cause existing functionality to change)
• [ ] 🔐 Security fix

What does this change do?

Makes sure the json.dumps doesn't automatically convert unicode characters.

What is your testing strategy?

Ran manual suite on all the affected methods.

Is this related to any issues?

Yes: https://github.com/surrealdb/surrealdb.py/issues/56

Have you read the Contributing Guidelines?

• [x] I have read the Contributing Guidelines