[minor] Update project classifiers

Author: stephane-caron

pyproject.toml

@@ -20,11 +20,10 @@ classifiers = [
     "License :: OSI Approved :: Apache Software License",
     "Operating System :: OS Independent",
     "Programming Language :: Python :: 3",
-    "Programming Language :: Python :: 3.10",
     "Programming Language :: Python :: 3.7",
     "Programming Language :: Python :: 3.8",
     "Programming Language :: Python :: 3.9",
-    "Topic :: Scientific/Engineering :: Mathematics",
+    "Programming Language :: Python :: 3.10",
     "Topic :: Scientific/Engineering :: Physics",
 ]
 dependencies = [