🐞 Fix GMM test

[ashwinvaidya17]

📝 Description

• The test_gmm.py is flaky as the randomly generated datapoints might end up near the wrong cluster.
  In the first image, the colours show the labels expected by the test but from the figure you can see that the clusters are close to the wrong cluster.

The solution is probably too conservative but the new clusters are now separated by a large margin.

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• 🐞 Bug fix (non-breaking change which fixes an issue)
• 🔨 Refactor (non-breaking change which refactors the code base)
• 🚀 New feature (non-breaking change which adds functionality)
• 💥 Breaking change (fix or feature that would cause existing functionality to not work as expected)
• 📚 Documentation update
• 🔒 Security update

✅ Checklist

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• 📋 I have summarized my changes in the CHANGELOG and followed the guidelines for my type of change (skip for minor changes, documentation updates, and test enhancements).
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• 🧪 I have written tests that support my changes and prove that my fix is effective or my feature works (if applicable).