[QDB-18152] - Fix frequency parameter in tests to conform with Pandas 3.0

[igorniebylski]

In pandas 2.1 datetime offset alias for second changed from S to s (both were still accepted). Since pandas 3.0 S parameter is no longer accepted, only valid value is s.

[Copilot]

Pull request overview

This PR updates the frequency parameter in pandas date_range calls from the deprecated 'S' (uppercase) to 's' (lowercase) to maintain compatibility with Pandas 3.0, which no longer accepts the uppercase variant for second-based frequencies.

Changes:

• Updated all occurrences of freq="S" to freq="s" in test files
• Updated the pytest fixture parameter and ID from "S" to "s" for consistency

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
tests/test_pandas.py	Updated frequency parameter in gen_series function from "S" to "s"
tests/conftest.py	Updated frequency parameter in _array_with_index_and_table function and frequency fixture parameter/ID from "S" to "s"

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