Fixed typos in files

[mukund-vish]

Description

Fixed a few typos found in error messages, docstrings, and the changelog:

• Corrected "funtion" to "function" in the NOT_IMPLEMENTED error message in safety/scan/ecosystems/base.py
• Fixed a stray extra bracket in the docstring type annotation in safety/safety.py (Optional[[Dict... → Optional[Dict...)
• Corrected "arguement" to "argument" in CHANGELOG.md

Type of Change

• Documentation update

Related Issues

Fixes #574

Testing

• No tests required

Checklist

• Code is well-documented
• Changelog is updated (if needed)
• No sensitive information (e.g., keys, credentials) is included in the code
• All PR feedback is addressed

Additional Notes

This is my first open source contribution and I am happy to make any adjustments if the maintainers prefer a different approach.

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