Update GitHub workflows to use Python 3.13 for both publish and test jobs, ensuring compatibility with the latest Python features and improvements.

Author: tumf

.github/workflows/publish.yml

@@ -5,7 +5,7 @@ on:
       - "v*"
     strategy:
       matrix:
-        python-version: ["3.11"]
+        python-version: ["3.13"]
 
 jobs:
   test:

.github/workflows/test.yml

@@ -11,7 +11,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: ["3.11"]
+        python-version: ["3.13"]
 
     steps:
       - uses: actions/checkout@v4