fixing pylint due to maxtext and MaxText import grouping.

[NicoGrande]

Description

Fixes pylint which was previously failing due to MaxText and maxtext imports being ungrouped.

Tests

Tested with CI

Checklist

Before submitting this PR, please make sure (put X in square brackets):

• I have performed a self-review of my code. For an optional AI review, add the gemini-review label.
• I have necessary comments in my code, particularly in hard-to-understand areas.
• I have run end-to-end tests tests and provided workload links above if applicable.
• I have made or will make corresponding changes to the doc if needed, including adding new documentation pages to the relevant Table of Contents (toctree directive) as explained in our documentation.

[codecov]

Codecov Report

❌ Patch coverage is 70.43478% with 34 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
src/maxtext/layers/attention_op.py	69.09%	29 Missing and 5 partials ⚠️

📢 Thoughts on this report? Let us know!