COMP: Default to ITK v5.4.5 wheel builds for v5.4.x branch

The v5.4.6 branch was defaulting to v6.0b02 ITK wheel tags inherited
from the main branch. This caused all v5.4.x remote modules to build
against the wrong ITK version unless they explicitly pinned
itk-wheel-tag and itk-python-package-tag.

Set the defaults to v5.4.5 so modules referencing @v5.4.6 get the
correct ITK version without needing explicit overrides.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: hjmjohnson

.github/workflows/build-test-package-python.yml

@@ -13,14 +13,14 @@ on:
         description: 'Github release version tag for the ITKPythonBuilds build archive to use'
         required: false
         type: string
-        default: 'v6.0b02'
+        default: 'v5.4.5'
       itk-python-package-tag:
         # See https://github.com/InsightSoftwareConsortium/ITKPythonPackage
         description: 'Git tag or commit hash for ITKPythonPackage build scripts to use'
         required: false
         type: string
         # v6.0b02
-        default: 'v6.0b02'
+        default: 'v5.4.5'
       itk-python-package-org:
         description: 'Github organization name for fetching ITKPythonPackage build scripts'
         required: false