small fix for tests :'( #539

Job	Run time
Lint	30s
Tests (3.9, git+https://github.com/pastas/pastas.git@v0.22.0)	1m 39s
Tests (3.9, git+https://github.com/pastas/pastas.git@v0.23.1)	1m 41s
Tests (3.9, git+https://github.com/pastas/pastas.git@v1.0.1)	1m 43s
Tests (3.9, git+https://github.com/pastas/pastas.git@v1.5.0)	1m 41s
Tests (3.9, git+https://github.com/pastas/pastas.git@dev)	1m 36s
Tests (3.10, git+https://github.com/pastas/pastas.git@v0.22.0)	1m 49s
Tests (3.10, git+https://github.com/pastas/pastas.git@v0.23.1)	1m 37s
Tests (3.10, git+https://github.com/pastas/pastas.git@v1.0.1)	1m 46s
Tests (3.10, git+https://github.com/pastas/pastas.git@v1.5.0)	1m 37s
Tests (3.10, git+https://github.com/pastas/pastas.git@dev)	1m 41s
Tests (3.11, git+https://github.com/pastas/pastas.git@v0.22.0)	1m 43s
Tests (3.11, git+https://github.com/pastas/pastas.git@v0.23.1)	1m 37s
Tests (3.11, git+https://github.com/pastas/pastas.git@v1.0.1)	1m 38s
Tests (3.11, git+https://github.com/pastas/pastas.git@v1.5.0)	1m 38s
Tests (3.11, git+https://github.com/pastas/pastas.git@dev)	11m 59s
Tests (3.12, git+https://github.com/pastas/pastas.git@v1.5.0)	1m 24s
Tests (3.12, git+https://github.com/pastas/pastas.git@dev)	1m 30s
	38m 49s

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