Make classifiers as dynamic in pyproject.toml

pyproject.toml

@@ -2,7 +2,7 @@
 requires-python = ">=3.9"
 name='cpnest'
 description='CPNest: Parallel nested sampling'
-dynamic=['version']
+dynamic=['version', 'classifiers']
 dependencies=['numpy','scipy','matplotlib','corner','tqdm']
 authors=[{name='Walter Del Pozzo', email='walter.delpozzo@ligo.org'},
         {name='John Veitch', email='john.veitch@ligo.org'}]