chore: remove unused module attribute #281

Job	Run time
ash-ci / mix deps.get	15s
ash-ci / mix igniter.upgrade	3s
ash-ci / audit	1m 15s
ash-ci / MIX_ENV=test mix.compile	1m 1s
ash-ci / mix docs	59s
ash-ci / mix ash.codegen --check	0s
ash-ci / mix credo --strict	4s
ash-ci / MIX_ENV=dev mix.compile	59s
ash-ci / mix dialyzer	4m 28s
ash-ci / mix format --check-formatted	55s
ash-ci / mix sobelow	56s
ash-ci / mix spark.cheat_sheets --check	52s
ash-ci / mix spark.formatter --check	3s
ash-ci / mix test	1m 22s
ash-ci / mix deps.unlock --check-unused	1m 2s
ash-ci / Deploy docs to GitHub pages.	7s
ash-ci / Release	0s
	14m 21s

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