Pin provider dependency in await test

[blampe]

I'm seeing an issue where this test can sometimes fail because it ends up installing p-k v4.15 (a version that predates the await logic under test). I was able to reproduce the issue locally. I suspect other jobs are passing perhaps because they have a more recent provider cached?

In any case, we want this test to run against the checked out provider and not something that's been released.

Update the test to point at the local binary.

[github-actions]

Does the PR have any schema changes?

Looking good! No breaking changes found.
No new resources/functions.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 42.45%. Comparing base (4270490) to head (d206ee9).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3791      +/-   ##
==========================================
+ Coverage   42.42%   42.45%   +0.03%     
==========================================
  Files          87       87              
  Lines       12693    12693              
==========================================
+ Hits         5385     5389       +4     
+ Misses       6911     6907       -4     
  Partials      397      397              

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