[NWD] Update SixLabors.ImageSharp version Bug: b/335372123 Bug: b/335372162 Change-Id: Ife8ad72293f6ecd56d24108fbe6dd5e181113454 Reviewed-on: https://gnocchi-internal-review.git.corp.google.com/c/third_party/epplus/+/200380 Reviewed-by: Adam Stevens <adamws@google.com>