Changed TaskSource key computation to handle OSError("source not available")

[kzvezdarov]

In some cases, inspect.getsource can raise OSError("source not available"), in addition to OSError("could not find source") (see: https://github.com/python/cpython/blob/3.12/Lib/inspect.py#L1088 and https://github.com/python/cpython/blob/3.12/Lib/inspect.py#L1096)

It seems appropriate to handle both instances of OSError with the same fallback. This commit simply expands the fallback handler to also check for source not available errors.

Closes #15384

Checklist

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[codspeed-hq]

CodSpeed Performance Report

Merging #15583 will not alter performance

_{Comparing kzvezdarov:fix-for-issue-15384 (bdd505d) with main (f524dc8)}

Summary

✅ 3 untouched benchmarks

[cicdw]

the check needs a fix - I added a suggestion for how to do it.

Thank you for identifying and contributing this @kzvezdarov !!

[cicdw]

awesome thank you!

[cicdw]

Just a heads up - this will go out in our next 3.x release which will most likely occur on Monday or Tuesday next week (10/7 or 10/8).