[prtester] Update python dependency (RSS-Bridge#4311)

This is necessary for glob.glob() with the root_dir argument

.github/workflows/prhtmlgenerator.yml

@@ -50,7 +50,7 @@ jobs:
       - name: Setup python
         uses: actions/setup-python@v5
         with:
-          python-version: '3.7'
+          python-version: '3.13'
           cache: 'pip'
       - name: Install requirements
         run: |