Change ruby feature to use mise by default #17

Job	Run time
test-scenarios (activestorage)	42s
test-scenarios (postgres-client)	44s
shellcheck	8s
test-autogenerated (bun, debian:latest)	20s
test-scenarios (ruby)	9m 33s
test-autogenerated (bun, ubuntu:latest)	18s
test-autogenerated (bun, mcr.microsoft.com/devcontainers/base:ubuntu)	20s
test-autogenerated (mysql-client, debian:latest)	16s
test-autogenerated (mysql-client, ubuntu:latest)	18s
test-autogenerated (mysql-client, mcr.microsoft.com/devcontainers/base:ubuntu)	25s
test-autogenerated (sqlite3, debian:latest)	17s
test-autogenerated (sqlite3, ubuntu:latest)	31s
test-autogenerated (sqlite3, mcr.microsoft.com/devcontainers/base:ubuntu)	26s
test-autogenerated (activestorage, debian:latest)	34s
test-autogenerated (activestorage, ubuntu:latest)	40s
test-autogenerated (activestorage, mcr.microsoft.com/devcontainers/base:ubuntu)	56s
test-autogenerated (postgres-client, debian:latest)	22s
test-autogenerated (postgres-client, ubuntu:latest)	31s
test-autogenerated (postgres-client, mcr.microsoft.com/devcontainers/base:ubuntu)	32s
test-autogenerated (ruby, debian:latest)	4m 36s
test-autogenerated (ruby, ubuntu:latest)	4m 40s
test-autogenerated (ruby, mcr.microsoft.com/devcontainers/base:ubuntu)	4m 53s
	32m 2s

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