update IBCAO bathymetry to v4.2

[trey-stafford]

Description

Update Bathymetric Chart of the Arctic Ocean (IBCAO) V4.2 bathymetry dataset to v4.2

Checklist

If an item on this list is done or not needed, simply check it with [x].

• Config lockfile updated (inv config.export > qgreenland/config/cfg-lock.json)
• Version bumped if needed (bumpversion (major|minor|patch|prerelease|build)
• CHANGELOG.md updated
• Documentation updated if needed
• New unit tests if needed

[trey-stafford]

This dataset uses about 708M on disk:

$ du -ch /share/appdata/qgreenland/working-storage/release-layers/bathymetric_raster/bathymetric_raster.tif
708M    /share/appdata/qgreenland/working-storage/release-layers/bathymetric_raster/bathymetric_raster.tif
708M    total

And at this point, the total package size is just shy of 3G:

$ du -ch /share/appdata/qgreenland/working-storage/release-packages/dev/v3.0.0alpha2-4cf66f18/QGreenland_v3.0.0alpha2-4cf66f18.zip
2.9G    /share/appdata/qgreenland/working-storage/release-packages/dev/v3.0.0alpha2-4cf66f18/QGreenland_v3.0.0alpha2-4cf66f18.zip
2.9G    total

[trey-stafford]

Declining in favor of #584