The Steam Client Beta has been updated with the following changes:
macOS
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Added "End of Life" alert for macOS 10.13 ("High Sierra") and 10.14 ("Mojave"). Steam Client support for these operating systems will end on February 15th, 2024 at 10am. See here for additional details.
Source: https://store.steampowered.com/news/gro ... 7390254906