This resolves a fatal error if `strict_types` PHP setting is enabled:
{{{
Argument #1 ($num) must be of type float, string given
}}}
Since the goal of the Site Health Info screen is to display raw values where possible, the `number_format()` call here does not seem to provide any benefit.
Props krishneup, sabernhardt, audrasjb, SergeyBiryukov.
Fixes#60364.
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