Allow images from media.githubusercontent.com (#9857)

Author: pascalberger

src/NuGetGallery/App_Data/Files/Content/Trusted-Image-Domains.json

@@ -26,6 +26,7 @@
         "img.shields.io",
         "i.imgur.com",
         "isitmaintained.com",
+        "media.githubusercontent.com",
         "opencollective.com",
         "snyk.io",
         "sonarcloud.io",