gitlab CI: remove diffutils & jq from required packages
They were used to compare the autoconf & meson builds, and aren't needed since we stopped doing that.
Fixes: cfddd81b ("remove autoconf build system")
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The migration is almost done, at least the rest should happen in the background. There are still a few technical difference between the old cluster and the new ones, and they are summarized in this issue. Please pay attention to the TL:DR at the end of the comment.
They were used to compare the autoconf & meson builds, and aren't needed since we stopped doing that.
Fixes: cfddd81b ("remove autoconf build system")