Try disabling your plugins directory. I’ve been fixing this repeatedly today. Disabling the plugin directory has, for me, allowed the page to load and complete the upgrade process. I suspect it is a specific plugin doing it but haven’t determined which yet.
Update
If you have W3 Total Cache 9.5.1 installed, deactivate it and try again. That has been the common factor and what is throwing errors in our error logs. Disable it, run the upgrade, enable it again.
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