fix(tests): declare pytz explicitly (pandas 3.0 dropped it as a hard dep)

tests/unit/test_parameters.py imports pytz directly. It previously arrived
transitively via pandas, but the refreshed lock resolves pandas 3.0.3 on
Python >=3.11, and pandas 3.0 removed pytz from its required dependencies
(it is now only a pandas extra). That broke test collection on 3.11+ with
`ModuleNotFoundError: No module named 'pytz'`.

Add pytz as an explicit dev dependency so the test suite no longer relies on
pandas's transitive graph, which differs across the Python matrix.

Co-authored-by: Isaac
Signed-off-by: Vikrant Puppala <vikrant.puppala@databricks.com>

Author: vikrantpuppala

poetry.lock

@@ -102,6 +102,12 @@ black = "^26.3.1"
 pytest-dotenv = "^0.5.2"
 pytest-cov = "^4.0.0"
 pytest-xdist = "^3.0.0"
+# tests/unit/test_parameters.py imports pytz directly. It used to arrive
+# transitively via pandas, but pandas 3.0 (resolved on Python >=3.11)
+# dropped pytz as a required dependency -- it is now only a pandas extra.
+# Declare it explicitly here so the test suite does not depend on pandas's
+# transitive graph, which differs across the Python matrix.
+pytz = ">=2020.1"
 numpy = [
     { version = ">=1.16.6", python = ">=3.10,<3.11" },
     { version = ">=1.23.4", python = ">=3.11" },