Fix support for Xarray 2025.01 and up #721 - #948
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Tweak `_build_xdc` test helper to force "ns" datetime resolution, avoiding dtype mismatches (datetime64[s] vs [ns]) between directly-built and netCDF-roundtripped arrays caused by xarray's non-nanosecond datetime support. Require at least xarray 2024.7.0 (highest version that still supports Python 3.9) to further reduce technical debt.
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Tweak
_build_xdctest helper to force "ns" datetime resolution, avoiding dtype mismatches (datetime64[s] vs [ns]) between directly-built and netCDF-roundtripped arrays caused by xarray's non-nanosecond datetime support.Require at least xarray 2024.7.0 (highest version that still supports Python 3.9) to further reduce technical debt.
fixes #721