chore(license): update to Unicode License v3 · unicode-org/conformance@462b60c

The following actions uses node12 which is deprecated and will be forced to run on node16: actions/checkout@v2, actions-rs/toolchain@v1, actions-rs/cargo@v1. For more info: https://github.blog/changelog/2023-06-13-github-actions-all-actions-will-run-on-node16-instead-of-node12-by-default/

The `set-output` command is deprecated and will be disabled soon. Please upgrade to using Environment Files. For more information see: https://github.blog/changelog/2022-10-11-github-actions-deprecating-save-state-and-set-output-commands/

unused variable: `e`

unused variable: `unsupported_options`

variable `is_scientific` is assigned to, but never used

variable `rounding_mode` is assigned to, but never used

value assigned to `is_scientific` is never read

value assigned to `rounding_mode` is never read

variable does not need to be mutable

static is never used: `SUPPORTED_OPTIONS`

single-character string constant used as pattern

useless conversion to the same type: `icu_provider::DataLocale`

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