Extending conda-forge.yml's os_version for other linux_*s

[jakirkham]

Currently we have the following for linux_64 in conda-forge.yml

cudnn-feedstock/conda-forge.yml

Lines 4 to 5 in a0ccd3d

	os_version:
	linux_64: cos7

However it would be good to specify all linux_*s there as well. Based on this logic it looks like cos7 for x86_64 and alma8 for aarch64

cudnn-feedstock/recipe/conda_build_config.yaml

Lines 47 to 54 in a0ccd3d

	docker_image:
	# TODO: We're using the aarch64-cuda:11.8 image, based on ubi8, only to get a
	# newer glibc for the CUDA 12 builds. For some reason, aarch64 + CUDA 12 is
	# expecting GLIBC_2.27.
	- quay.io/condaforge/linux-anvil-aarch64-cuda:11.8 # [linux and aarch64] # glibc 2.28
	- quay.io/condaforge/linux-anvil-cos7-x86_64 # [linux and x86_64] # glibc 2.17
	- quay.io/condaforge/linux-anvil-aarch64-cuda:11.8 # [linux and aarch64] # glibc 2.28
	- quay.io/condaforge/linux-anvil-cuda:11.8 # [linux and x86_64] # glibc 2.17

So something like this could be a good starting point

os_version:
  linux_64: cos7
  linux_aarch64: alma8

As follow up, we will want to clear out the conda_build_config.yaml workarounds here

Edit - Removed linux_ppc64le above as it was dropped in PR: #84

Edit (2) - Updated linux_aarch64 to alma8