[core] pinned python version for tests

Author: MrClock8163

.github/workflows/python-publish.yml

@@ -16,7 +16,7 @@ jobs:
 
       - uses: actions/setup-python@v5
         with:
-          python-version: "3.x"
+          python-version: "3.13"
 
       - name: Build release distributions
         run: |

.github/workflows/run-tests.yml

@@ -44,7 +44,7 @@ jobs:
       - name: Setup Python
         uses: actions/setup-python@v5
         with:
-          python-version: 3.x
+          python-version: 3.13
 
       - name: Build and install package
         run: python -m pip install .[all]