ENH: Use newest ITK Python package in CI

Author: dzenanz

.github/workflows/build-test-publish.yml

@@ -255,7 +255,7 @@ jobs:
         run: |
             python -m pip install --upgrade pip
             python -m pip install ninja
-            python -m pip install itk>=5.4rc3
+            python -m pip install itk>=5.4
             python -m pip install matplotlib
             python -m pip install itkwidgets
             # Issues with 5.7.0