[v2] Fix sdist lockfile test

[hssyoo]

GitHub Action that runs on Python 3.12 and macOS 13 is failing sdist tests because 1 of the lockfiles is generated with a newline at the end. This commit strips leading/trailing newlines to ensure consistent comparisons.

[ashovlin]

I think we fixed some of them up manually when merging the performance work since we were adding a new lock file and then moved it. Maybe that threw it off? But seems okay to fix here.

[hssyoo]

I think we fixed some of them up manually when merging the performance work since we were adding a new lock file and then moved it. Maybe that threw it off? But seems okay to fix here.

This is specifically for source distribution lockfiles and it's oddly only affecting 1 test matrix, so I'd assume they're unrelated. But yeah doing basic sanitization here is a marginal improvement either way.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 0.00%. Comparing base (619640c) to head (1ea37ef).
Report is 21 commits behind head on v2.

Additional details and impacted files

@@    Coverage Diff     @@
##   v2   #9326   +/-   ##
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