workflows: test-matplotlib: patch source, simplify python-wheels path

Signed-off-by: Trevor Gamblin <tgamblin@baylibre.com>

Author: threexc

.github/workflows/test-matplotlib.yml

@@ -47,12 +47,6 @@ jobs:
             python-version: '3.12'
 
     steps:
-      - name: Checkout python-wheels
-        uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0  # v7.0.0
-        with:
-          path: python-wheels-repo
-          persist-credentials: false
-
       - name: Checkout matplotlib v${{ env.MPL_VERSION }}
         uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0  # v7.0.0
         with:
@@ -61,13 +55,25 @@ jobs:
           fetch-depth: 0
           persist-credentials: false
 
+      - name: Checkout python-wheels
+        uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0  # v7.0.0
+        with:
+          path: python-wheels
+          persist-credentials: false
+
       - name: Set up Python ${{ matrix.python-version }}
         uses: astral-sh/setup-uv@fac544c07dec837d0ccb6301d7b5580bf5edae39  # v8.2.0
         with:
           python-version: ${{ matrix.python-version }}
           activate-environment: true
           enable-cache: false
 
+      # We need to patch the matplotlib source to increase a threading test
+      # timeout for the native runners
+      - name: patch matplotlib source
+        run: |
+          git apply python-wheels/patches/matplotlib/${{ env.MPL_VERSION }}/00*.patch
+
       - name: Install OS dependencies
         run: |
           echo 'Acquire::Retries "3";' | sudo tee /etc/apt/apt.conf.d/80-retries