Fix font size in dependency scanning docs

What does this MR do and why?

This MR adds a font-size attribute to the ul element of the Supported languages and package managers section of the Dependency Scanning docs, to ensure consistency.

Screenshots or screen recordings

Before Change

Font size for ul elements is larger than the rest of the table entries:

After Change

Font size for ul elements matches the rest of the table entries:

How to set up and validate locally

Numbered steps to set up and validate the change are strongly suggested.

MR acceptance checklist

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