MNT: switch back to setup-python in CI

Author: ngoldbaum

.github/workflows/macos.yml

@@ -124,14 +124,9 @@ jobs:
         fetch-tags: true
         persist-credentials: false
 
-    - uses: astral-sh/setup-uv@6b9c6063abd6010835644d4c2e1bef4cf5cd0fca
+    - uses: actions/setup-python@a26af69be951a213d495a4c3e4e4022e16d87065 # v5.6.0
       with:
-        activate-environment: true
         python-version: ${{ matrix.version }}
-        enable-cache: false
-
-    - run:
-        uv pip install --python=${{ matrix.version }} pip
 
     - uses: maxim-lobanov/setup-xcode@60606e260d2fc5762a71e64e74b2174e8ea3c8bd # v1.6.0
       if: ${{ matrix.build_runner[0] == 'macos-13' }}

.github/workflows/windows.yml

@@ -35,14 +35,9 @@ jobs:
         persist-credentials: false
 
     - name: Setup Python
-      uses: astral-sh/setup-uv@6b9c6063abd6010835644d4c2e1bef4cf5cd0fca
+    - uses: actions/setup-python@a26af69be951a213d495a4c3e4e4022e16d87065 # v5.6.0
       with:
-        activate-environment: true
         python-version: ${{ matrix.compiler-pyversion[1] }}
-        enable-cache: false
-
-    - run:
-        uv pip install --python=${{ matrix.version }} pip
 
     - name: Install build dependencies from PyPI
       run: |