Re-enable pypy support when cramjam allows decompress_into memoryview

[nsmith-]

Per

rootfilespec/.github/workflows/ci.yml

Lines 44 to 48 in 40ad0a5

	# Pypy disabled for now due to https://github.com/milesgranger/cramjam/issues/142
	# (no way to decompress into a memoryview)
	# include:
	# - python-version: "pypy-3.10"
	# runs-on: ubuntu-latest