COMP: Update CI best practices and Python 3.10+

[hjmjohnson]

Update CI infrastructure and Python version requirement.

Changes

1. Python 3.10+ — bump requires-python from >=3.9 to >=3.10 (Python 3.9 EOL was Oct 2025)
2. CI action v5.4.6 — update ITKRemoteModuleBuildTestPackageAction from v5.4.2 to v5.4.6 for latest runner support (macOS 15, Apple Silicon)
3. Pin ITK v5.4.5 — the v5.4.6 action's default ITK commit has a DCMTK ExternalProject include path issue (ijg12/include exported but missing); pin to v5.4.5 release where DCMTK builds correctly

[dzenanz]

Error:

-- Not adding IOTransformDCMTKModule(TransformIO::DCMTK) to factory meta-module ITKTransformIO because it is outside ITK source tree.
  -- Configuring done (0.6s)
  CMake Error in src/CMakeLists.txt:
    Imported target "ITK::ITKDCMTKModule" includes non-existent path
  
      "/home/runner/work/ITKIOTransformDCMTK/ITK-build/Modules/ThirdParty/DCMTK/ITKDCMTK_ExtProject/ijg12/include"
  
    in its INTERFACE_INCLUDE_DIRECTORIES.  Possible reasons include:
  
    * The path was deleted, renamed, or moved to another location.
  
    * An install or uninstall procedure did not complete successfully.
  
    * The installation package was faulty and references files it does not
    provide.
  
  
  
  -- Generating done (0.0s)
  CMake Generate step failed.  Build files cannot be regenerated correctly.
  Command exited with the value: 1
  Error(s) when configuring the project

[dzenanz]

D:\a\ITKIOTransformDCMTK\ITK-build\Modules\ThirdParty\DCMTK\ITKDCMTK_ExtProject-build\config\include\dcmtk/config/osconfig.h(938): fatal error C1189: #error: DCMTK was configured to use C++11 features, but your compiler does not or was not configured to provide them.

[hjmjohnson]

Upstream fixes for both DCMTK blockers submitted: InsightSoftwareConsortium/ITK#6072 (targeting release-5.4 for v5.4.6).

Once merged, this PR can drop the itk-git-tag: 'v5.4.5' pin and use the action's default ITK commit, which will include both fixes.