add Python 3.13.5

Author: bedroge

easystacks/software.eessi.io/2025.06/eessi-2025.06-eb-5.1.2-2025b.yml

@@ -1,2 +1,6 @@
 easyconfigs:
   - GCC-14.3.0.eb
+  - Python-3.13.5-GCCcore-14.3.0.eb:
+      options:
+        # see https://github.com/easybuilders/easybuild-easyconfigs/pull/24189
+        from-commit: 348d94859e21f06d6eae72412f1445b7be982dfd