Resolve unittests deprecation warning

[github-actions[bot]]

:point_left: Launch a binder notebook on branch _pyiron/pyiron_workflow/unittestsdeprecation

[codacy-production[bot]]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
:white_check_mark: +0.00% (target: -1.00%)	:white_check_mark: ∅

Coverage variation details

| | Coverable lines | Covered lines | Coverage | | ------------- | ------------- | ------------- | ------------- | | Common ancestor commit (7bd7c3ebcee3c8a982e494a8516bf65b3cb908a3) | 3946 | 3524 | 89.31% | | | Head commit (1d1ba92513ed7f217503201cdcb163dccb9c3d70) | 3946 (+0) | 3524 (+0) | 89.31% (**+0.00%**) | **Coverage variation** is the difference between the coverage for the head and common ancestor commits of the pull request branch: ` - `

Diff coverage details

| | Coverable lines | Covered lines | Diff coverage | | ------------- | ------------- | ------------- | ------------- | | Pull request (#322) | 0 | 0 | **∅ (not applicable)** | **Diff coverage** is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: `/ * 100%`

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_{Codacy will stop sending the deprecated coverage status from June 5th, 2024. Learn more}