CI: Remove the pytest-xdist and pytest-rerunfailures plugins from the Benchmarks workflow (#3314)

Author: seisman

.github/workflows/benchmarks.yml

@@ -69,8 +69,6 @@ jobs:
             pytest
             pytest-codspeed
             pytest-mpl
-            pytest-rerunfailures
-            pytest-xdist
 
       # Download cached remote files (artifacts) from GitHub
       - name: Download remote data from GitHub
@@ -93,4 +91,4 @@ jobs:
         with:
           # 'bash -el -c' is needed to use the custom shell.
           # See https://github.com/CodSpeedHQ/action/issues/65.
-          run: bash -el -c "python -c \"import pygmt; pygmt.show_versions()\"; PYGMT_USE_EXTERNAL_DISPLAY=false python -m pytest -r P -n auto --reruns 2 --pyargs pygmt --codspeed"
+          run: bash -el -c "python -c \"import pygmt; pygmt.show_versions()\"; PYGMT_USE_EXTERNAL_DISPLAY=false python -m pytest -r P --pyargs pygmt --codspeed"