Install setuptools

Try to prevent `ERROR: Project file:///home/runner/work/pygmt/pygmt has a 'pyproject.toml' and its build backend is missing the 'build_editable' hook. Since it does not have a 'setup.py' nor a 'setup.cfg', it cannot be installed in editable mode. Consider using a build backend that supports PEP 660`.

Author: weiji14

.github/workflows/benchmarks.yml

@@ -62,7 +62,9 @@ jobs:
         with:
           run: |
             python -m pip install numpy pandas xarray netCDF4 packaging \
-                                  pytest pytest-benchmark pytest-codspeed
+                                  pytest pytest-benchmark pytest-codspeed \
+                                  setuptools
+            python -m pip list
             make install
             make test PYTEST_EXTRA="-r P --codspeed"
         env: