build: support TensorFlow 2.5 and Python 3.9

[redeboer]

Hi @mayou36, it seems that phasespace can safely update to tensorflow 2.5. (There only seem to be problems with test_physics.py, but seems that was already there due to uproot.)

Should anything else be changed?

[jonas-eschle]

That looks good, I would tend to remove 3.6, but we can also leave it another round, no damage done.

[jonas-eschle]

Looks good, and we can address the test failure in #41

[jonas-eschle]

I've added you as a maintainer to the repo, so you do have the rights to merge (and more), is that fine? So feel free to merge

[redeboer]

I've added you as a maintainer to the repo, so you do have the rights to merge (and more), is that fine? So feel free to merge

Thanks! Yeah I'm interested in tackling #39, so that it becomes possible to switch to switch between tensorflow and numpy. I hope to get back to that later this week. Can look into #41 as well then.

[jonas-eschle]

Okay that sounds good, feel free to assign yourself to issues.

[redeboer]

@mayou36 Could you create a release for this PR? Then tensorwaves can upgrade to TF 2.5 as well ;)
We can also wait until #46 and it's potential follow-up for numpy, but that could be a bit too much for a version bump.

[jonas-eschle]

Jep, just making sure that conda forge goes as well, that has a weird issue currently