Separate cibuildwheel install

.github/workflows/wheels.yml

@@ -119,9 +119,11 @@ jobs:
         with:
           python-version: "3.x"
 
-      - name: Build wheels
+      - name: Install cibuildwheel
         run: |
           python3 -m pip install -r .ci/requirements-cibw.txt
+
+      - name: Build wheels
           python3 -m cibuildwheel --output-dir wheelhouse
         env:
           CIBW_ARCHS: ${{ matrix.cibw_arch }}
@@ -163,6 +165,10 @@ jobs:
         with:
           python-version: "3.x"
 
+      - name: Install cibuildwheel
+        run: |
+          & python.exe -m pip install -r .ci/requirements-cibw.txt
+
       - name: Prepare for build
         run: |
           choco install nasm --no-progress
@@ -171,8 +177,6 @@ jobs:
           # Install extra test images
           xcopy /S /Y Tests\test-images\* Tests\images
 
-          & python.exe -m pip install -r .ci/requirements-cibw.txt
-
           & python.exe winbuild\build_prepare.py -v --no-imagequant --architecture=${{ matrix.arch }}
         shell: pwsh