chore: fix conda environment.yml syntax (#2500)

I think the environment file parser got stricter in a recent version of conda/mamba. Errant comma was tolerated before but no longer. Or we just haven't noticed the env was broken.

Also fix the benchmarks CI, the job that collects the results needed seaborn.

Author: wpbonelli

.github/workflows/benchmark.yml

@@ -87,6 +87,9 @@ jobs:
       - name: Install FloPy
         run: uv sync
 
+      - name: Install seaborn
+        run: uv pip install seaborn
+
       - name: Download all artifacts
         uses: actions/download-artifact@v4
         with:

etc/environment.yml

@@ -38,7 +38,7 @@ dependencies:
   - pytest-cov
   - pytest-dotenv
   - pytest-xdist
-  - pyzmq>=25.1.2,
+  - pyzmq>=25.1.2
   - syrupy
   - virtualenv