Revert "sanity check that hdf5 install needed"

It is indeed needed.

This reverts commit e4db17d.

.github/workflows/test_and_deploy.yml

@@ -51,6 +51,12 @@ jobs:
         with:
           path: "~/.cellfinder"
           key: models-${{ hashFiles('~/.cellfinder/**') }}
+      # install additional Macos dependencies
+      - name: install HDF5 libraries
+        if: matrix.os == 'macos-latest'
+        run: |
+          brew install hdf5
+          export PATH="/usr/local/opt/hdf5/bin:$PATH"
       # Run tests
       - uses: neuroinformatics-unit/actions/test@v2
         with: