Update

[jburel]

This PR replaces the usage of fake file by an ome.xml one
The fake file is not recognised in that context
The problem was noticed while testing ome/bioformats#4130

Note that the build is green but there is an error

Reading series #1
    .error: octave_base_value::reshape (): wrong type argument 'octave_java'
error: called from
    bfGetPlane at line 102 column 7
    bfopen at line [15](https://github.com/ome/bio-formats-octave-docker/actions/runs/8343148427/job/22832802777?pr=57#step:5:16)5 column 13
    test_bfopen at line 6 column 6
    test at line 9 column 1