Fix windows classifier in testsuite (#4958)

Author: IAlibay

testsuite/pyproject.toml

@@ -21,7 +21,7 @@ classifiers = [
     "License :: OSI Approved :: GNU Lesser General Public License v3 or later (LGPLv3+)",
     "Operating System :: POSIX",
     "Operating System :: MacOS :: MacOS X",
-    "Operating System :: Microsoft :: Windows ",
+    "Operating System :: Microsoft :: Windows",
     "Programming Language :: Python",
     "Programming Language :: Python :: 3",
     "Programming Language :: Python :: 3.10",