MAINT: Adds Python 3.13 to CI.

Author: arokem

.github/workflows/test.yml

@@ -13,7 +13,7 @@ jobs:
     strategy:
       max-parallel: 4
       matrix:
-        python-version: ["3.10", "3.11", "3.12"]
+        python-version: ["3.10", "3.11", "3.12", "3.13"]
         nibabel-pre: [true, false]
 
     steps: