update windows test requirements

Author: themisvaltinos

tests/core/test_context.py

@@ -1506,14 +1506,19 @@ def test_requirements(copy_to_temp_path: t.Callable):
         "dev", no_prompts=True, skip_tests=True, skip_backfill=True, auto_apply=True
     ).environment
     requirements = {"ipywidgets", "numpy", "pandas", "test_package"}
+    if IS_WINDOWS:
+        requirements.add("pendulum")
     assert environment.requirements["pandas"] == "2.2.2"
     assert set(environment.requirements) == requirements
 
     context._requirements = {"numpy": "2.1.2", "pandas": "2.2.1"}
     context._excluded_requirements = {"ipywidgets", "ruamel.yaml", "ruamel.yaml.clib"}
     diff = context.plan_builder("dev", skip_tests=True, skip_backfill=True).build().context_diff
     assert set(diff.previous_requirements) == requirements
-    assert set(diff.requirements) == {"numpy", "pandas"}
+    reqs = {"numpy", "pandas"}
+    if IS_WINDOWS:
+        reqs.add("pendulum")
+    assert set(diff.requirements) == reqs
 
 
 def test_deactivate_automatic_requirement_inference(copy_to_temp_path: t.Callable):