Mixed Content Warning for Featured Images and http in Source Code

The SEO tool I am using is showing that the featured images on my pages are serving "mixed content" http (vs https) and when I view source on pages I am seeing http (vs https) on lots of URLS in the meta. I have been poking around the backend but I am pretty clueless on how to start to fix this.

An example page with the issue: https://www.dropmedia.tv/portfolio-video-photo/sram
Example image: http://static1.squarespace.com/static/5edffc7a80285e1df49a02d0/5ee0f1d36369185256c99869/5ee0f1d36369185256c998eb/1633552221958/Cerro%2BGordo_1.52.2.jpg?format=1500w

Will, was this resolved? I have a similar issue.