CUDA single lock

Circumvent issues with https://github.com/prefix-dev/pixi/issues/1051 and declare a single manifest that also contains CUDA environment support.

pyproject.toml

@@ -28,11 +28,6 @@ classifiers = [
   "Topic :: Software Development :: Libraries :: Python Modules",
 ]
 
-# warning: if you add/remove/pin dependencies, also update
-# tool.pixi.dependencies in this file, and the equivalent settings at and
-# helpers/cuda/pixi.toml files
-#
-# (c.f.: https://github.com/prefix-dev/pixi/issues/1051)
 dependencies = [
   "clapper",
   "click",
@@ -84,10 +79,6 @@ platforms = ["linux-64", "osx-arm64"]
 linux = "4.19.0"
 cuda = "12.1"
 
-# warning: if you add/remove/pin dependencies, also update project.dependencies
-# in this file, and the equivalent settings at and helpers/cuda/pixi.toml files
-#
-# (c.f.: https://github.com/prefix-dev/pixi/issues/1051)
 [tool.pixi.dependencies]
 clapper = "*"
 click = "*"