🧪 Add tests for minify function in compress.py

[dioncx]

🎯 What: Addresses the lack of unit tests for the `minify` function in `json_memory/compress.py`.\n📊 Coverage: Ensures the function correctly strips whitespace and properly respects the `ensure_ascii=False` setting, explicitly testing unicode inputs.\n✨ Result: Improves test coverage for the `json-memory` library and ensures reliable minification behavior.

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PR created automatically by Jules for task 13437060860387241310 started by @dioncx

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