fix cmems download forecast test

[veenstrajelmer]

=========================== short test summary info ============================
FAILED tests/test_download.py::test_download_cmems_forecast - ValueError: Requested timerange (2024-05-14 00:00:00 to 2024-05-16 00:00:00) is not fully within timerange of reanalysis product (1993-01-01 00:00:00 to 2021-06-30 00:00:00) or forecast product (2022-06-01 00:00:00 to 2024-03-31 00:00:00).
==== 1 failed, 103 passed, 42 deselected, 47 warnings in 721.36s (0:12:01) =====

This only fails in the pytest-mindeps github action, so it seems that the older copernicusmarine version does not give the correct time ranges. Therefore, update the minimal version requirement for this package.