The support for python 2.7 was removed on June 19, 2023. Related issue: https://github.com/actions/setup-python/issues/672

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CPython version >=2.7.0 <2.8.0-0 is not supported by actions/setup-python. This probably means you are using a deprecated version. If this is not the case, you may suppress the warning setting input "allow-build" to either "info" or "allow".