COMP: Upgrade GitHub Actions CI python-version from 3.8 to "3.10"

Aims to fix GitHub Actions CI build (macos-14), saying:

> Version 3.8 was not found in the local cache
> Error: Version 3.8 with arch arm64 not found
> The list of all available versions can be found here: https://raw.githubusercontent.com/actions/python-versions/main/versions-manifest.json

Note that "3.10" must have double-quotes, to avoid being interpreted as the floating point number `3.1`.

.github/workflows/ElastixGitHubActions.yml

@@ -61,7 +61,7 @@ jobs:
     - name: Set up Python
       uses: actions/setup-python@v3
       with:
-        python-version: 3.8
+        python-version: "3.10"
 
     - name: Install build dependencies
       run: |