chore: update pyproject.toml to remove python 3.12 and add python 3.14

Author: zmx27

pyproject.toml

@@ -14,7 +14,7 @@ maintainers = [
 description = "Calculators for PDF, bond valence sum, and other quantities based on atom pair interaction."
 keywords = ['PDF', 'BVS', 'atom', 'overlap', 'calculator', 'real-space']
 readme = "README.rst"
-requires-python = ">=3.11, <3.14"
+requires-python = ">=3.12, <3.15"
 classifiers = [
         'Development Status :: 5 - Production/Stable',
         'Environment :: Console',
@@ -25,9 +25,9 @@ classifiers = [
         'Operating System :: Microsoft :: Windows',
         'Operating System :: POSIX',
         'Operating System :: Unix',
-        'Programming Language :: Python :: 3.11',
         'Programming Language :: Python :: 3.12',
         'Programming Language :: Python :: 3.13',
+        'Programming Language :: Python :: 3.14',
         'Topic :: Scientific/Engineering :: Physics',
         'Topic :: Scientific/Engineering :: Chemistry',
 ]