Merge pull request #869 from mwcraig/remove-old-_blkavg #569

Job	Run time
ubuntu-py38-oldestdeps	1m 1s
macos-py310-astroscrappy11	1m 28s
ubuntu-py312-bottleneck	1m 17s
ubuntu-py310	1m 3s
ubuntu-py311	1m 0s
ubuntu-py312	1m 6s
macos-py312	49s
windows-py312	1m 59s
ubuntu-ruff	13s
ubuntu-build_docs	1m 5s
ubuntu-py312-test-alldeps-devdeps	2m 49s
	13m 50s

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