Add 3.13 to unit-tests.yml (#3432)

Author: vfdev-5

.github/workflows/unit-tests.yml

@@ -43,7 +43,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-latest]
-        python-version: ["3.9", "3.10", "3.11", "3.12"]
+        python-version: ["3.9", "3.10", "3.11", "3.12", "3.13"]
         pytorch-channel: [pytorch, pytorch-nightly]
         include:
           # includes a single build on windows