Adding Python 3.13 to test matrix

Author: gershnik

.github/workflows/test.yml

@@ -21,7 +21,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [macos-latest, ubuntu-latest, windows-latest]
-        python-version: ["3.8", "3.9", "3.10", "3.11", "3.12", "pypy-3.8", "pypy-3.9"]
+        python-version: ["3.8", "3.9", "3.10", "3.11", "3.12", "3.13", "pypy-3.8", "pypy-3.9"]
         exclude:
           - os: windows-latest
             python-version: "pypy-3.8" #no cryptography available there