chore(deps-dev): Bump ex_doc in the dev-dependencies group #1543

Job	Run time
mix deps.get	19s
mix hex.audit	26s
MIX_ENV=test mix.compile	2m 46s
mix dialyzer	4m 35s
mix credo --strict	32s
mix git_ops.check_message	37s
mix doctor --full --raise	31s
mix ash_postgres.generate_migrations --check	44s
mix sobelow --config	37s
mix spark.cheat_sheets --check	38s
mix format --check-formatted	39s
mix spark.formatter --check	52s
mix test	1m 3s
mix deps.unlock --check-unused	38s
MIX_ENV=dev mix.compile	0s
mix docs	0s
Deploy docs to GitHub pages.	0s
	14m 57s

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