set min PL as 1.7

[Borda]

What does this PR do?

Reaction to #910

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[Borda]

@otaj, the py3.10 is failing with TV, see:
https://github.com/Lightning-AI/lightning-bolts/actions/runs/3376424612/jobs/5604130908

[Borda]

Seems there is some issue with installing onnx on py3.10

[otaj]

I'm on it

[otaj]

sparseml is forcing old onnx version, which would require compilation from source on 3.10 in the CI. We won't be doing that, so for now CI runs on 3.7 and 3.9 :sadpanda: