Add Python 3.12 package classifier to pyproject.toml

ccad3869 · Ben Mares · Ricardo Vieira · b4ebd741 · ccad3869
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -33,6 +33,7 @@ classifiers = [
    "Programming Language :: Python :: 3.9",
    "Programming Language :: Python :: 3.10",
    "Programming Language :: Python :: 3.11",
+    "Programming Language :: Python :: 3.12",
 ]

 keywords = [