@gundersonlyle – Hi – what I did was log into the hosting provider (siteground in my case), and renamed the Ninja Plugin to ninja-forms to ninja-forms-ERROR.
To do that I logged into the hosting provider and did the following (these step may differ with your website hosting provider) Website > Site Tools > File Manager > public_html > wp-content > plugins > renamed ninja-forms to ninja-forms-ERROR
I waited overnight and clicked on the link that was provided in the email (Your Site is Experiencing a Technical Issue) and it worked.
I was then able to access the Admin area of WP and updated ALL the plugins. I went back into the hosting provider and rename ninja-forms-ERROR back to ninja-forms