feat: improvements to ruff and new python 3.15

Author: vinitkumar

.github/workflows/pythonpackage.yml

@@ -28,7 +28,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: [pypy-3.10, pypy-3.11, '3.10', '3.11', '3.12', '3.13', '3.14', '3.14t']
+        python-version: [pypy-3.10, pypy-3.11, '3.10', '3.11', '3.12', '3.13', '3.14', '3.14t', '3.15.0-alpha.1']
         os: [
           ubuntu-latest,
           windows-latest,
@@ -115,8 +115,7 @@ jobs:
     - name: Install dependencies
       run: |
         uv pip install --system -e .
-        uv pip install --system ruff>=0.3.0
 
     - name: Run ruff
-      run: ruff check json2xml tests
+      run: uvx ruff check json2xml tests