Add Pillow to Ruff users (#8523)

## Summary See python-pillow/Pillow#6966 :) ## Test Plan Looked at the Markdown preview!
astral-sh · Nov 6, 2023 · c07947b · c07947b
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@@ -415,6 +415,7 @@ Ruff is used by a number of major open-source projects and companies, including:
 - [PDM](https://github.com/pdm-project/pdm)
 - [PaddlePaddle](https://github.com/PaddlePaddle/Paddle)
 - [Pandas](https://github.com/pandas-dev/pandas)
+- [Pillow](https://github.com/python-pillow/Pillow)
 - [Poetry](https://github.com/python-poetry/poetry)
 - [Polars](https://github.com/pola-rs/polars)
 - [PostHog](https://github.com/PostHog/posthog)