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Black 26.3.1 dropped support for Python 3.9 and earlier (this change was introduced in version 25.12.0). The current markers will cause installation failures on Python 3.8 and 3.9 because they attempt to install an incompatible version of Black.
To resolve this while still providing the security update for supported environments, you should restrict Black 26.3.1 to Python 3.10+ and use the previous compatible versions for older Python environments. Note that those older versions will remain vulnerable to the security issue mentioned in the PR description.