Pin `kerchunk >=0.2.4` and fix change of API in new Kerchunk: compressor is now a filter

[valeriupredoi]

Description

Checklist

• [x] This pull request has a descriptive title and labels
• [x] This pull request has a minimal description (most was discussed in the issue, but a two-liner description is still desirable)
• [ ] Unit tests have been added (if codecov test fails)
• [x] Any changed dependencies have been added or removed correctly (if need be)
• [ ] All tests pass

kerchunk=0.2.2 is very old; kerchunk=0.2.3 had issues with numcodecs dependencies;kerchunk=0.2.4is nice and happy and has an optimization we worked on, but it moved thecompressor and compressor level inside thefiltersdictionary - this PR fixes that; also, this PR pins Kerchunk to>=0.2.4` so we don't have to run into old issues, and be able to use the optimization (selection on Dataset or Group to do kerchunking on)

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 75.00000% with 8 lines in your changes are missing coverage. Please review.

Project coverage is 87.78%. Comparing base (9e2bfd3) to head (20a246c).

Files	Patch %	Lines
activestorage/netcdf_to_zarr.py	75.00%	8 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #192 +/- ## ========================================== - Coverage 88.40% 87.78% -0.62% ========================================== Files 8 8 Lines 664 696 +32 ========================================== + Hits 587 611 +24 - Misses 77 85 +8 ```

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