PlantCV v3.13.3

What's Changed

• Use fewer contours in testing roi_objects by @JorgeGtz in #844
• Update hyperspectral calibration function by @nfahlgren and @JorgeGtz in #845. Thanks to @billygrahamram for bringing the issue to our attention and providing the sample data

Full Changelog: v3.13.2...v3.13.3