Bump bioimageio.spec dependency

Author: constantinpape

setup.py

@@ -25,7 +25,7 @@
         "Programming Language :: Python :: 3.8",
     ],
     packages=find_namespace_packages(exclude=["tests"]),  # Required
-    install_requires=["bioimageio.spec>=0.4.3", "imageio>=2.5", "numpy", "ruamel.yaml", "tqdm", "xarray"],
+    install_requires=["bioimageio.spec>=0.4.4", "imageio>=2.5", "numpy", "ruamel.yaml", "tqdm", "xarray"],
     include_package_data=True,
     extras_require={
         "test": ["pytest", "black", "mypy"],