Bug fix: Added password_validator_fixed.py with uppercase and lowercase validation

[gouriphadnis0301]

Description: This PR fixes a bug in the password validation logic where the previous script did not properly enforce the presence of uppercase and lowercase letters in passwords.

Changes made:

• Added a new file password_validator_fixed.py in the folder PASSWORD RELATED/password-validator/.

• Updated password validation rules to ensure:

      -          At least one uppercase letter
      -          At least one lowercase letter
      -          At least one number
      -          At least one special character
      -          Minimum length of 6 and maximum length of 12
      -          No spaces
  

Steps to verify:

1. Run password_validator_fixed.py.
2. Enter passwords that meet some but not all criteria.
3. Verify that the script rejects passwords missing uppercase or lowercase letters.
4. verify that valid passwords are accepted.

Notes:

• Original PASSWORD_VALIDATOR.py remains unchanged.
• This fix ensures proper enforcement of password strength requirements as described in the initial rules.

Impact:

• Improves security by enforcing stronger password rules.
• Helps users avoid creating weak passwords.