Add Plone 6.1 classifier (#147)

See #146

Author: gforcada

src/trove_classifiers/__init__.py

@@ -182,6 +182,7 @@
     "Framework :: Plone :: 5.2",
     "Framework :: Plone :: 5.3",
     "Framework :: Plone :: 6.0",
+    "Framework :: Plone :: 6.1",
     "Framework :: Plone :: Addon",
     "Framework :: Plone :: Core",
     "Framework :: Plone :: Distribution",