buildtools-tarball: Add python3-jinja2
This is used by various pieces of the result handling code, particularly the
performance testing and we're seeing autobuilder failures that are
easiest resolved using this.
Acked-by: Tim Orling <ticotimo@gmail.com>
Signed-off-by: Tim Orling <ticotimo@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>