update link for migration page

[sfc-gh-jreini]

Description

Please include a summary of the changes and the related issue that can be included in the release announcement. Please also include relevant motivation and context.

Other details good to know for developers

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Type of change

• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] New Tests
• [ ] This change includes re-generated golden test results
• [ ] This change requires a documentation update

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[!IMPORTANT] Update PACKAGES_MIGRATION_LINK URL in deprecation.py.

• Behavior:
  • Update PACKAGES_MIGRATION_LINK URL in deprecation.py to https://www.trulens.org/component_guides/other/trulens_eval_migration/.

^{This description was created by for 00467304a5932e524f3cc6de565807a1fc0c5121. It will automatically update as commits are pushed.}