workaround galaxyproject/galaxy#20525

Author: mr-c

setup.py

@@ -167,6 +167,7 @@ def _find_package_data(base: str, globs: list[str], root: str = "cwltool") -> li
         "deps": [
             "galaxy-tool-util>=22.1.2,!=23.0.1,!=23.0.2,!=23.0.3,!=23.0.4,!=23.0.5,<25.1",
             "galaxy-util <25.1",
+            "pillow",  # workaround for https://github.com/galaxyproject/galaxy/pull/20525
         ],
     },
     python_requires=">=3.9, <3.14",