chore: update .tool-version #113

Job	Run time
ash-ci (8.0) / mix deps.get	18s
ash-ci (8.0) / MIX_ENV=dev mix.compile	3m 52s
ash-ci (8.0) / MIX_ENV=test mix.compile	4m 3s
ash-ci (8.0) / audit	4m 21s
ash-ci (8.0) / mix docs	37s
ash-ci (8.0) / mix format --check-formatted	33s
ash-ci (8.0) / mix credo --strict	39s
ash-ci (8.0) / mix dialyzer	5m 24s
ash-ci (8.0) / mix sobelow	24s
ash-ci (8.0) / mix spark.cheat_sheets --check	26s
ash-ci (8.0) / mix spark.formatter --check	41s
ash-ci (8.0) / mix test	4m 18s
ash-ci (8.0) / mix deps.unlock --check-unused	29s
ash-ci (8.0) / Deploy docs to GitHub pages.	9s
ash-ci (8.0) / Release	0s
	26m 14s

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