Add windows tzdata dependency as system does not have tz info

Author: timvink

pyproject.toml

@@ -35,6 +35,7 @@ dependencies = [
     "babel>=2.7.0",
     "gitpython>=3.1.44",
     "mkdocs>=1.0",
+    "tzdata>=2023.3; sys_platform == 'win32'",
 ]
 
 [project.urls]