Update pyproject.toml

How you specify license stuff changed and was causing some warnings.

Author: ptth222

pyproject.toml

@@ -8,12 +8,12 @@ description = "Extract, validate, and convert tabular data for deposition into r
 readme = "README.rst"
 requires-python = ">=3.10"
 keywords = ["mwtab", "metabolomics workbench"]
-license = {file = "LICENSE"}
+license = "LicenseRef-BSD-3-Clause-Clear-With-Publication-Clause"
+license-files = ["LICENSE"]
 classifiers = [
 	'Environment :: Console',
     'Intended Audience :: Developers',
     'Intended Audience :: Science/Research',
-    'License :: OSI Approved :: BSD License',
     'Operating System :: OS Independent',
     'Programming Language :: Python :: 3.10',
     'Programming Language :: Python :: 3.11',