Remove tests-scipy session, make it simpler

noxfile.py

@@ -19,13 +19,6 @@ def check(session):
 @nox.session(name="tests")
 def run_tests(session):
     """Run unit tests and generate a coverage report"""
-    session.install("-e", ".[test]")
-    session.run("pytest", "--cov=autograd", "--cov-report=xml")
-
-
-@nox.session(name="tests-scipy")
-def run_tests_scipy(session):
-    """Run additional unit tests with SciPy installed"""
     session.install("-e", ".[test,scipy]")
     session.run("pytest", "--cov=autograd", "--cov-report=xml")
 
@@ -38,5 +31,3 @@ def ruff(session):
     session.install("ruff")
     session.run('ruff', 'check', '.')
     session.notify("tests")
-    session.notify("tests-scipy")
-