fix: install timezone data on Windows

pyproject.toml

@@ -49,6 +49,7 @@ dependencies = [
     "pyyaml>=6.0,<7.0.0",
     "filelock>=3.25.2",
     "packaging>=24.0",
+    "tzdata>=2025.2; sys_platform == 'win32'",
     "defusedxml>=0.7.1,<1.0.0",
     "pypdf>=5.0.0,<6.0.0",
     "python-docx>=1.1.0,<2.0.0",

tests/channels/test_channel_plugins.py

@@ -1552,6 +1552,7 @@ def test_optional_dependency_metadata_for_enable():
     ):
         assert not any(dep.startswith(dep_name) for dep in required)
     for dependency in (
+        "tzdata>=2025.2; sys_platform == 'win32'",
         "defusedxml>=0.7.1,<1.0.0",
         "pypdf>=5.0.0,<6.0.0",
         "python-docx>=1.1.0,<2.0.0",