chore: deprecated withPassword(String) method (#3328)

[kimsunghyun1995]

This PR removes the deprecated withPassword(String) method from RedisURI.Builder as discussed in #3328.

Important Note:

Existing code that calls withPassword(String) will continue to work without modification because:

• String implements CharSequence
• All existing string parameters will automatically route to withPassword(CharSequence) method
• The functionality remains identical

This approach minimizes the breaking change impact while still removing the deprecated method. All existing tests continue to pass without modification.

This PR is a follow-up to #1157 and addresses part of #3328.

Checklist

• I have read the contribution guidelines.
• I have created a feature request first to discuss my contribution intent.
• I applied code formatting rules using the mvn formatter:format target. No formatting-related changes included.
• Documentation-only change, no test cases needed.