add tests for mpl 3.9

this MR adds test scenarios for matplotlib 3.9 and updates the lock files for the test environments. Apparently the update of the colorbar does not work as expected because it shrinks the axes on every update. therefore we skip these tests for now (see 7ba3b03e) and we need to investigate this further

assigned to @Chilipp

added 1 commit

• 3d799cee - update lock files

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mentioned in commit 22d4d103

mentioned in merge request !44 (merged)