[pkginfo] Remove unused parameter
To retrieve cube dependencies or cube requirements,
no more need to pass the 'oldkey' parameter to _cube_deps function as this parameter is unused.
extend-diff-ignore = "^(__pkginfo__\.py$|doc/_themes/cubicweb/static/(logo-cubicweb-small\.svg|cubicweb\.ico|logo-cubicweb\.svg)$|cubicweb\.spec$|setup\.cfg$|cubicweb/misc/cwfs)"