Merge pull request matplotlib#29497 from QuLogic/arm-tests

ci: Fix cache key for Matplotlib data

Author: tacaswell

.github/workflows/tests.yml

@@ -236,10 +236,10 @@ jobs:
             ~/.cache/matplotlib
             !~/.cache/matplotlib/tex.cache
             !~/.cache/matplotlib/test_cache
-          key: 4-${{ runner.os }}-py${{ matrix.python-version }}-mpl-${{ github.ref }}-${{ github.sha }}
+          key: 5-${{ matrix.os }}-py${{ matrix.python-version }}-mpl-${{ github.ref }}-${{ github.sha }}
           restore-keys: |
-            4-${{ runner.os }}-py${{ matrix.python-version }}-mpl-${{ github.ref }}-
-            4-${{ runner.os }}-py${{ matrix.python-version }}-mpl-
+            5-${{ matrix.os }}-py${{ matrix.python-version }}-mpl-${{ github.ref }}-
+            5-${{ matrix.os }}-py${{ matrix.python-version }}-mpl-
 
       - name: Install Python dependencies
         run: |