Packager keeps putting cyrillic-ext and greek-ext in my subsets

[simoncozens]

See e.g. https://github.com/google/fonts/pull/5758#issuecomment-1942033279 fontbakery is claiming that cyrillic-ext and greek-ext are unnecessary in the METADATA.pb, but it's the packager that put them there, not me, so one of them is wrong...