Configure setuptools_scm via pyproject.toml

Configuring it via `setup.py` is deprecated. Use `python -m
setuptools_scm` to get the version of the current checkout.

Author: Hugo Osvaldo Barrera

pyproject.toml

@@ -0,0 +1,6 @@
+[build-system]
+requires = ["setuptools>=45", "wheel", "setuptools_scm>=6.2"]
+
+[tool.setuptools_scm]
+write_to = "barcode/version.py"
+version_scheme = "post-release"

setup.py

@@ -32,10 +32,6 @@
         "Topic :: Software Development :: Libraries :: Python Modules",
     ],
     entry_points={"console_scripts": ["python-barcode = barcode.pybarcode:main"]},
-    use_scm_version={
-        "version_scheme": "post-release",
-        "write_to": "barcode/version.py",
-    },
     setup_requires=["setuptools_scm"],
     extras_require={"images": ["pillow"]},
     include_package_data=True,