Support 3.13 in test on pr and matrix test

Author: bobleesj

.github/workflows/matrix-and-codecov-on-merge-to-main.yml

@@ -21,9 +21,9 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-latest, windows-latest, macos-13, macos-14]
-        python-version: ["3.11", "3.12"]
+        python-version: ["3.11", "3.12", "3.13"]
     env:
-          LATEST_PYTHON_VERSION: "3.12"
+          LATEST_PYTHON_VERSION: "3.13"
     steps:
       - name: Check out diffpy.labpdfproc
         uses: actions/checkout@v4

.github/workflows/tests-on-pr.yml

@@ -25,7 +25,7 @@ jobs:
           auto-update-conda: true
           environment-file: environment.yml
           auto-activate-base: false
-          python-version: 3.12
+          python-version: 3.13
 
       - name: Conda config
         run: >-