Remove redundant __ne__ methods

[khanashes]

Summary

In Python 3, when __eq__ is defined, Python automatically provides __ne__ by negating __eq__. Explicitly defining __ne__ is redundant and unnecessary code.

Changes

• Removed redundant __ne__ method from HTTPBasicAuth class
• Removed redundant __ne__ method from HTTPDigestAuth class

Testing

All existing authentication tests pass (50 tests), confirming that Python's automatic __ne__ implementation works correctly:

50 passed, 561 deselected, 8 warnings in 5.33s

Benefits

• Cleaner, more maintainable code
• Follows Python 3 best practices
• Reduces code duplication
• No functional changes - behavior remains identical