CI, BENCH: pin seaborn to avoid namespace issues with asv

[shanedsnyder]

Temporary workaround for issue mentioned by @tylerjereddy in #972.

[tylerjereddy]

Oh, I see why it is still failing, we use a flag for asv check in CI that leverages the "existing" Python interpreter/environment for all deps instead of using an isolated venv (to save on CI time).

So, I suppose we may want to additionally do this here:

--- a/.github/workflows/main_ci.yml
+++ b/.github/workflows/main_ci.yml
@@ -92,6 +92,7 @@ jobs:
           export LD_LIBRARY_PATH=$PWD/darshan_install/lib
           export DYLD_FALLBACK_LIBRARY_PATH=$PWD/darshan_install/lib
           cd darshan-util/pydarshan/benchmarks
+          python -m pip install "seaborn==0.13.0"
           python -m asv check -E existing
       - name: codecov check
         uses: codecov/codecov-action@v3

[shanedsnyder]

Thanks, I made a small tweak to your suggested changes to get things working on Python 3.7, where seaborn-13 is apparently not available. Looks like things are passing now across the board.