chore(deps-dev): Bump ex_doc in the dev-dependencies group (#732) #1545

Job	Run time
mix deps.get	27s
mix hex.audit	30s
MIX_ENV=test mix.compile	2m 36s
mix doctor --full --raise	30s
mix git_ops.check_message	26s
mix credo --strict	30s
mix dialyzer	4m 28s
mix format --check-formatted	27s
mix ash_postgres.generate_migrations --check	26s
mix sobelow --config	28s
mix spark.cheat_sheets --check	30s
mix spark.formatter --check	43s
mix test	53s
mix deps.unlock --check-unused	32s
MIX_ENV=dev mix.compile	2m 36s
mix docs	34s
Deploy docs to GitHub pages.	8s
	16m 44s

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