COMP: Update CI best practices and Python 3.10+

- Update ITKRemoteModuleBuildTestPackageAction to v5.4.6
- Update minimum Python to 3.10+
- Fix empty secrets: block that prevented build workflow from starting

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

Author: hjmjohnson

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

@@ -1,4 +1,3 @@
-
 name: Build, test, package
 
 on: [push,pull_request]
@@ -12,3 +11,4 @@ jobs:
     with:
       test-notebooks: false
     secrets:
+      pypi_password: ${{ secrets.pypi_password }}