bump minimum elixir version and test matrix · Kraigie/nostrum@66780ca

The following actions uses node12 which is deprecated and will be forced to run on node16: actions/checkout@v2. For more info: https://github.blog/changelog/2023-06-13-github-actions-all-actions-will-run-on-node16-instead-of-node12-by-default/

Regex.regex?/1 is deprecated. Use Kernel.is_struct(term, Regex) or pattern match on %Regex{} instead

Application.get_env/3 is discouraged in the module body, use Application.compile_env/3 instead

Logger.warn/1 is deprecated. Use Logger.warning/2 instead

Logger.warn/1 is deprecated. Use Logger.warning/2 instead

Logger.warn/1 is deprecated. Use Logger.warning/2 instead

Logger.warn/1 is deprecated. Use Logger.warning/2 instead

Logger.warn/1 is deprecated. Use Logger.warning/2 instead

Logger.warn/1 is deprecated. Use Logger.warning/2 instead

Logger.warn/1 is deprecated. Use Logger.warning/2 instead

Logger.warn/1 is deprecated. Use Logger.warning/2 instead

Logger.warn/1 is deprecated. Use Logger.warning/2 instead

Logger.warn/1 is deprecated. Use Logger.warning/2 instead

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