Updated password validation logic to require a minimum of 8 characters.

GTC Open Source Initiative

Pull Request Description

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Related Issue: [Specify the issue number or describe the problem that this pull request addresses.]

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Please review and check the following items before submitting your pull request:

[ ] I have executed the command flutter pub run build_runner build to generate the necessary auto routes files.
[ ] I have verified that the auto route generation did not introduce any errors or warnings.
[ ] I have tested the changes locally and they are functioning as expected.
[ ] My code follows the project's coding style and guidelines.
[ ] All existing and new tests are passing.
[ ] I have added necessary documentation or updated existing documentation (if applicable).
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