Fix minor issues in CONTRIBUTING.md

[acosmicflamingo]

Fixes #880

• Modify the CLA hyperlink to point to the right URL

• Update 'pip install' commands to support dependency groups usage in pyproject.toml

  • test-cu12 and test-cu13 were moved from 'optional-dependencies' section to 'dependency-groups' section

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[acosmicflamingo]

Also found issue with trying to install test dependencies using CUDA 12.x; cuda-bindings needs to be pinned in pyproject.toml as well.

[acosmicflamingo]

/ok to test

[acosmicflamingo]

While running tests for the test_extending module, I noticed this failure:

>   ???
E   cuda.bindings.nvjitlink.nvJitLinkError: ERROR_OUTDATED_LIBRARY (14)
E   nvJitLink error log: ERROR NVVM_ERROR_INVALID_INPUT (4) in nvvmAddNVVMContainerToProgram, may need newer version of nvJitLink library
E   

It appears to be something others have encountered: numba/numba#10353. After reading, I noticed that in my pip environment that was generated from test-cu13, that nvidia-nvjitlink dependency was missing (and installing it fixes the issue).

I suppose this shouldn't be a surprise because it's listed as an optional dependency in pyproject.toml, I'm wondering whether the command in this PR needs to be updated further to look like this pip install -e ".[cu13]" --group test-cu13 or have test-cu13 automatically include cu13 and then the command could be pip install -e . --group test-cu13.