chore(deps): Bump ash from 2.15.17 to 2.15.20 #1035

Job	Run time
mix deps.get	36s
mix hex.audit	34s
MIX_ENV=test mix.compile	3m 38s
mix git_ops.check_message	49s
mix credo --strict	41s
mix dialyzer	7m 53s
mix doctor --full --raise	43s
mix format --check-formatted	36s
mix ash_postgres.generate_migrations --check	48s
mix sobelow --config	47s
mix spark.cheat_sheets --check	44s
mix spark.formatter --check	51s
mix test	1m 27s
mix deps.unlock --check-unused	35s
MIX_ENV=dev mix.compile	0s
mix docs	0s
mix git-ops.release	0s
Deploy docs to GitHub pages.	0s
	20m 42s

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