chore(deps-dev): bump igniter from 0.6.7 to 0.6.21 in the dev-dependencies group #21

Job	Run time
ash-ci / mix igniter.upgrade	0s
ash-ci / Report Mix Dependencies	0s
ash-ci / audit	1m 33s
ash-ci / Community Files Check	6s
ash-ci / MIX_ENV=test mix.compile	1m 28s
ash-ci / mix format --check-formatted	22s
ash-ci / mix git_ops.check_message	0s
ash-ci / mix spark.cheat_sheets --check	41s
ash-ci / mix spark.formatter --check	28s
ash-ci / mix test	50s
ash-ci / mix ash.codegen --check	0s
ash-ci / mix dialyzer	3m 30s
ash-ci / mix credo --strict	59s
ash-ci / mix sobelow	5s
ash-ci / mix deps.unlock --check-unused	21s
ash-ci / MIX_ENV=dev mix.compile	1m 17s
ash-ci / mix doctor --full --raise	0s
ash-ci / mix docs	1m 12s
ash-ci / Deploy docs to GitHub pages.	-1s
ash-ci / NIF ${{ matrix.nif }} - ${{ matrix.job.target }} (${{ matrix.job.os }})	0s
ash-ci / Release	0s
	12m 51s

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