I just got this issue on my local development environment I added a plugin folder called "gravityforms" to the plugin directory.
I tried deleting it, and when I did the message went away on page refresh. So I added it back into the plugins dir again to confirm, and sure enough the message appears on my dashboard again.
Why would a plugin directory trigger this message?
I tried running chmod -R 755 wp-content/plugins/gravityforms/ but that didn't affect anything.