Revert test changes of PR 1034 #1067
                
     Merged
            
            
          
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This reverts the test changes made in #1034, to fix #1066.
The changes were all in a single test and only applied to
ipykernel >= 7which at the time was expected to useanyio. Nowipykernel 7will not includeanyioso the changes are no longer required.This is tested in the
ipykerneldownstream CI tests, which will fail until this is merged tomainhere.As the changes are all in test code they are not user-facing so there are no ramifications for releases.