Use Python from uv for on runner jobs

Author: TimPansino

.github/workflows/tests.yml

@@ -283,9 +283,8 @@ jobs:
   windows:
     env:
       TOTAL_GROUPS: 1
-      UV_PYTHON: "3.13"
-      UV_PYTHON_DOWNLOADS: "never"
-      UV_PYTHON_PREFERENCE: "only-system"
+      UV_PYTHON_DOWNLOADS: "manual"
+      UV_PYTHON_PREFERENCE: "only-managed"
 
     strategy:
       fail-fast: false
@@ -301,17 +300,14 @@ jobs:
         run: |
           git fetch --tags origin
 
-      - name: Install Python
-        uses: actions/setup-python@e797f83bcb11b83ae66e0230d6156d7c80228e7c # 6.0.0
-        with:
-          python-version: |
-            3.13
-            3.14
-            3.14t
-
       - name: Install uv
         uses: astral-sh/setup-uv@2ddd2b9cb38ad8efd50337e8ab201519a34c9f24 # 7.1.1
 
+      - name: Install Python
+        run: |
+          uv python install -f 3.13 3.14 3.14t
+          uv python install -f --default 3.13
+
       - name: Install Dependencies
         run: |
           uv tool install tox --with tox-uv
@@ -356,9 +352,8 @@ jobs:
   windows_arm64:
     env:
       TOTAL_GROUPS: 1
-      UV_PYTHON: "3.13"
-      UV_PYTHON_DOWNLOADS: "never"
-      UV_PYTHON_PREFERENCE: "only-system"
+      UV_PYTHON_DOWNLOADS: "manual"
+      UV_PYTHON_PREFERENCE: "only-managed"
 
     strategy:
       fail-fast: false
@@ -374,17 +369,14 @@ jobs:
         run: |
           git fetch --tags origin
 
-      - name: Install Python
-        uses: actions/setup-python@e797f83bcb11b83ae66e0230d6156d7c80228e7c # 6.0.0
-        with:
-          python-version: |
-            3.13
-            3.14
-            3.14t
-
       - name: Install uv
         uses: astral-sh/setup-uv@2ddd2b9cb38ad8efd50337e8ab201519a34c9f24 # 7.1.1
 
+      - name: Install Python
+        run: |
+          uv python install -f 3.13 3.14 3.14t
+          uv python install -f --default 3.13
+
       - name: Install Dependencies
         run: |
           uv tool install tox --with tox-uv