release: Update pixi.toml version to 3.0.1

pixi.toml

 [project]
 name = "coal"
-version = "3.0.0"
+version = "3.0.1"
 description = "An extension of the Flexible Collision Library"
 platforms = ["linux-64", "osx-64", "osx-arm64", "win-64"]
 channels = ["conda-forge"]