Intent to orphan python-pytest-testmon

Hey! I intent to orphan python-pytest-testmon.

I no longer have use for it and it is a leaf package.

Th package is usually low maintenance, except now it doesn't build with Python
3.8 yet.

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So my plan is to orphan it and eventually also retire it if nobody picks it
until the 3.8 rebuild (in ~1 month).

Let me know if you want it, I'll orphan it early next week otherwise.