Update: On the Colab issue @ragman-google shared the following workaround, which works (!) as a temporary solution until they are able to patch the current runtime:
- Open command pallette (bottom left menu → second icon from the bottom)
- Search for “use fallback runtime version” and hit enter
Colab will now use the older runtime version, which still works with Julia 
. So if you maintain any Colab notebooks (@ageron @JohnnyChen94 @jonathan-laurent), you should add temporary instructions at the top of the notebook that users should switch to the old runtime version to get things working. Then, hopefully the current runtime will be patched soon 
.