Slightly modernize build system

Makefile

@@ -17,10 +17,10 @@ develop: upgrade-dev requirements-install  ## Install project for development
 	pip install -e .
 
 upgrade-dev:  ## Upgrade packages for development
-	pip install -U setuptools pip pip-tools tox
+	pip install -U setuptools pip pip-tools pytest tox
 
 test: lint  ## Run tests
-	python setup.py test
+	pytest
 
 tox:  ## Run Python tests
 	tox

requirements_dev.in

@@ -5,6 +5,7 @@ ipython
 mypy
 pip-tools>=6.4
 pyflakes
+pytest
 tox>=3.24
 
 packaging>=20

requirements_dev.txt

@@ -1,5 +1,5 @@
 #
-# This file is autogenerated by pip-compile with Python 3.10
+# This file is autogenerated by pip-compile with Python 3.12
 # by the following command:
 #
 #    pip-compile --output-file=requirements_dev.txt requirements_dev.in
@@ -28,8 +28,6 @@ decorator==5.1.1
     # via ipython
 distlib==0.3.7
     # via virtualenv
-exceptiongroup==1.1.3
-    # via ipython
 executing==2.0.0
     # via stack-data
 filelock==3.12.4
@@ -38,6 +36,8 @@ filelock==3.12.4
     #   virtualenv
 flake8==6.1.0
     # via -r requirements_dev.in
+iniconfig==2.0.0
+    # via pytest
 ipython==8.16.1
     # via -r requirements_dev.in
 jedi==0.19.1
@@ -58,6 +58,7 @@ packaging==23.2
     #   black
     #   build
     #   pyproject-api
+    #   pytest
     #   tox
 parso==0.8.3
     # via jedi
@@ -75,7 +76,9 @@ platformdirs==3.11.0
     #   tox
     #   virtualenv
 pluggy==1.3.0
-    # via tox
+    # via
+    #   pytest
+    #   tox
 prompt-toolkit==3.0.39
     # via ipython
 ptyprocess==0.7.0
@@ -96,29 +99,20 @@ pyproject-api==1.6.1
     # via tox
 pyproject-hooks==1.0.0
     # via build
+pytest==8.0.2
+    # via -r requirements_dev.in
 six==1.16.0
     # via asttokens
 stack-data==0.6.3
     # via ipython
-tomli==2.0.1
-    # via
-    #   black
-    #   build
-    #   mypy
-    #   pip-tools
-    #   pyproject-api
-    #   pyproject-hooks
-    #   tox
 tox==4.11.3
     # via -r requirements_dev.in
 traitlets==5.11.2
     # via
     #   ipython
     #   matplotlib-inline
 typing-extensions==4.8.0
-    # via
-    #   black
-    #   mypy
+    # via mypy
 virtualenv==20.24.5
     # via tox
 wcwidth==0.2.8

tox.ini

@@ -4,8 +4,8 @@
 # and then run "tox" from this directory.
 
 [tox]
-envlist = py27, py37, py38
+envlist = py312, py311, py310
 
 [testenv]
-deps = -rrequirements.txt
-commands = python setup.py test
+deps = pytest -rrequirements.txt
+commands = pytest