Loosen the version constraint on CIL's dependencies

[gfardell]

CIL's conda build currently pins versions both numpy versions and the optional dependencies:

CIL/recipe/meta.yaml

Line 56 in f0f97a4

- {{ pin_compatible('numpy', min_pin='x.x', max_pin='x.x') }}

CIL/recipe/meta.yaml

Lines 76 to 80 in f0f97a4

	run_constrained:
	- tomophantom=2.0.0
	- astra-toolbox>=1.9.9.dev5,<=2.1
	- tigre>=2.4,<=2.6
	- ccpi-regulariser=24.0.1

We want to free up these constraints and replace it with:

1. Documented tested combinations either in the readme or landing page (python, numpy, tigre, astra, tomophantom, ccpi-regulariser)
2. Environment files for conda install that will guarantee tested combinations

This will mean when newer versions are released it's simple to update the environment and run unit tests to confirm compatibility.