MAINT: Pin pytest-rerunfailures in oldest deps

[snbianco]

The "oldest version for all dependencies" CI job has been failing since May 13th. I tracked this down to a release of pytest-rerunfailures that requires a newer version of pytest. Pinning the version to 16.1 for oldestdeps makes the job pass again.

[bsipocz]

Ahh, good catch. Fixing that job was on my list.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 73.23%. Comparing base (a0ec925) to head (81ab898).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3596   +/-   ##
=======================================
  Coverage   73.23%   73.23%           
=======================================
  Files         226      226           
  Lines       21010    21010           
=======================================
  Hits        15386    15386           
  Misses       5624     5624           

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[bsipocz]

Thanks! I'll merge once the oldestdeps job is passing, anything else is irrelevant here