move specification of build dependency on setuptools-scm from setup.py to pyproject.toml

pyproject.toml

@@ -0,0 +1,3 @@
+[build-system]
+# https://github.com/pypa/setuptools-scm/tree/v7.1.0?tab=readme-ov-file#pyprojecttoml-usage
+requires = ["setuptools>=45", "setuptools_scm[toml]>=6.2"]

setup.py

@@ -70,6 +70,5 @@ setuptools.setup(
         # https://github.com/doceme/py-spidev
         "spidev",
     ],
-    setup_requires=["setuptools_scm"],
     tests_require=["pytest"],
 )