bundlespec: phase out the `_bundlespeccgversions` mapping
The `_bundlespeccgversions` mapping is redundant with the `cg.version`
parameter. We move all users to the `cg.version` version and phase out the
`_bundlespeccgversions` mapping.
#require docutils gettext $ $TESTDIR/check-gendoc pt_BR checking for parse errors