title: Google collab pip doesn't get recent package version
body: <p>I'm using Goggle colab to test code that I maintain in PyPI. However, the runtime environment does not recognize the existence of recent versions of my package. I see that there is an environment variable LAST_FORCED_REBUILD, which has a date that is several days ago. Perhaps I need a more recent rebuild? It used to be possible to do a &quot;Factory reset&quot; from the &quot;Runtime&quot; menu, but that is not present. I've tried all the reset options, but that date remains.</p>