Make sure the package can be installed with Python 3.12.

Author: anawas

pyproject.toml

@@ -1,11 +1,11 @@
 [project]
 name = "ecallisto-ng"
-version = "1.1.8"
+version = "1.1.9"
 authors = [{name = "Vincenzo Timmel", email = "vincenzo.timmel@fhnw.ch"}]
 description = "A Python package for the fetching (and some processing and plotting) of eCallisto data based on request and pandas."
 readme = "README.md"
 
-requires-python = ">=3.9,<3.12"
+requires-python = ">=3.9,<3.13"
 
 classifiers = [
     "Programming Language :: Python :: 3",