test: add non-zero timezone offset test case per CodeRabbit review

Co-Authored-By: AJ Steers <aj@airbyte.io>

Author: devin-ai-integration[bot]

unit_tests/sources/file_based/test_file_based_stream_reader.py

@@ -429,6 +429,13 @@ def documentation_url(cls) -> AnyUrl:
             set(),
             id="start_date_with_utc_offset",
         ),
+        pytest.param(
+            ["**/*.csv"],
+            {"start_date": "2023-06-05T08:54:07+05:00", "streams": []},
+            {"a.csv", "a/b.csv", "a/c.csv", "a/b/c.csv", "a/c/c.csv", "a/b/c/d.csv"},
+            set(),
+            id="start_date_with_non_zero_offset",
+        ),
         pytest.param(
             ["**/*.csv"],
             {"start_date": "2023-06-01", "streams": []},