Fix requires-python to be compatible for build and publish action

Author: ArBridgeman

pyproject.toml

@@ -1,7 +1,7 @@
 [project]
 name = "exasol-toolbox"
 version = "1.1.0"
-requires-python = "^3.9"
+requires-python = ">=3.9,<4.0"
 description = "Your one-stop solution for managing all standard tasks and core workflows of your Python project."
 authors = [
     {name = "Nicola Coretti", email = "[email protected]"},