Apple silicon CI -- update `testing.yml` #838

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5 errors

Could not determine environment name from file ci/envs/312-latest.yaml

Error: Error: ENOENT: no such file or directory, open 'ci/envs/312-latest.yaml'

If your environment file is not a YAML file containing `name` at the top level, please specify the environment name directly.

ENOENT: no such file or directory, open 'ci/envs/312-latest.yaml'

ENOENT: no such file or directory, lstat '/Users/runner/work/_temp/setup-micromamba/micromamba-shell'