COMP: Update ITKRemoteModuleBuildTestPackageAction to v5.4.6

Bump reusable workflow from v5.4.5 to v5.4.6 which includes
GHCR-mirrored dockcross image pre-pull for more reliable Python
wheel builds.

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

Author: hjmjohnson

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

@@ -4,10 +4,10 @@ on: [push,pull_request]
 
 jobs:
   cxx-build-workflow:
-    uses: InsightSoftwareConsortium/ITKRemoteModuleBuildTestPackageAction/.github/workflows/build-test-cxx.yml@v5.4.5
+    uses: InsightSoftwareConsortium/ITKRemoteModuleBuildTestPackageAction/.github/workflows/build-test-cxx.yml@v5.4.6
 
   python-build-workflow:
-    uses: InsightSoftwareConsortium/ITKRemoteModuleBuildTestPackageAction/.github/workflows/build-test-package-python.yml@v5.4.5
+    uses: InsightSoftwareConsortium/ITKRemoteModuleBuildTestPackageAction/.github/workflows/build-test-package-python.yml@v5.4.6
     with:
       test-notebooks: false
     secrets: