Merge pull request #39 from sbillinge/p313

fix: python version pinned to 3.13 in merge to main workflow

Author: sbillinge

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

@@ -17,6 +17,7 @@ jobs:
       project: diffpy.srxplanar
       c_extension: false
       headless: false
+      python_version: 3.13
       run: |
         pip install diffpy.srxconfutils