chore(misc): Add PEP723 inline script metadata to charts-local.py

This makes it possible to simply run the script e.g. via `run run charts-local.py` and without
having to setup and maintain a virtual environment.

dev/charts-local.py

@@ -1,6 +1,14 @@
 #!/usr/bin/env python3
 # SPDX-FileCopyrightText: 2024 Zentrum für Digitale Souveränität der Öffentlichen Verwaltung (ZenDiS) GmbH
 # SPDX-License-Identifier: Apache-2.0
+# /// script
+# requires-python = ">=3.12"
+# dependencies = [
+#     "configargparse",
+#     "gitpython",
+#     "pyyaml",
+# ]
+# ///
 
 import os.path
 import logging