ci: test oldest supported attrs

[blueyed]

No description provided.

[blueyed]

hypothesis 4.38.2 bumped the attrs requirement itself.

[blueyed]

Covers the new compat code now: https://codecov.io/gh/pytest-dev/pytest/compare/8c9ea5e055e7ef7a7d33db65c781adee16b55bc0...b0fd8742da28c2df2bd20cab9d67b432ce542951/src/src/_pytest/compat.py

[asottile]

I think we should instead >=19.2 on features

[nicoddemus]

I think we should instead >=19.2 on features

That's arguable, but neverthless it doesn't discard this PR, we don't know when features will get released.

Back to the point, not sure we should require attrs>=19.2: we are an upstream library which is loaded into the user's runtime, so we should be careful when to bump our minimal requirements, specially for a widely used library such as attrs.

Given that so far this is the only issue that has bitten us, I would leave it alone. If more issues start to creep in, we should definitely reconsider this though.