feat: add file uploader

Description

Brings the submodules up to date and updated the Dockerfile so that everything works with the FileUploadComponent.

relates fjelltopp/ckanext-zarr#9

Updated both ckanext-zarr and ckanext-fjelltopp-theme

[ ] The Jira ticket for this issue has been updated to "Ready to Review" or equivalent.
[x] I have developed these changes in discussion with the appropriate project manager.
[x] My code follows the general Fjelltopp documentation (see Confluence).
[ ] I have made corresponding changes to the Fjelltopp documentation (see Confluence).
[x] I have rebased this branch with master.
[x] New dependency changes have been committed.
[ ] I have added automated tests that prove my fix is effective or that my feature works.
[ ] New and existing tests pass locally with my changes.
[x] My changes generate no new warnings.
[x] I have performed a self-review of my own code.
[x] I have assigned at least one reviewer.
[ ] I have assigned at least one label to this PR: "patch", "minor", "major".