Skip test on Python 3.9 due to scikit-learn version

Added a pytest skipif marker to skip test_external_templates on Python 3.9, as the required scikit-learn version is only supported on Python 3.10 and above.

Author: karangattu

tests/playwright/examples/test_external_templates.py

@@ -1,3 +1,4 @@
+import sys
 from pathlib import Path
 
 import pytest
@@ -12,9 +13,12 @@
     )
 
 
+@pytest.mark.skipif(
+    sys.version_info[:2] == (3, 9),
+    reason="Skipping test for Python 3.9 since scikit-learn pinned version is only supported on Python 3.10+",
+)
 @pytest.mark.only_browser("chromium")
 @pytest.mark.flaky(reruns=reruns, reruns_delay=reruns_delay)
 @pytest.mark.parametrize("ex_app_path", get_apps("py-shiny-templates"))
 def test_external_templates(page: Page, ex_app_path: str) -> None:
-
     validate_example(page, ex_app_path)