Bump actions/cache from 4 to 5 in the github-actions group

.github/workflows/build-ultraplot.yml

@@ -84,7 +84,7 @@ jobs:
       # Cache Baseline Figures (Restore step)
       - name: Cache Baseline Figures
         id: cache-baseline
-        uses: actions/cache@v4
+        uses: actions/cache@v5
         if: ${{ env.IS_PR }}
         with:
           path: ./ultraplot/tests/baseline # The directory to cache

.github/workflows/main.yml

@@ -37,7 +37,7 @@ jobs:
 
       - name: Restore test map cache
         id: restore-map
-        uses: actions/cache/restore@v4
+        uses: actions/cache/restore@v5
         with:
           path: .ci/test-map.json
           key: test-map-v2-${{ github.event.pull_request.base.sha }}

.github/workflows/test-map.yml

@@ -40,7 +40,7 @@ jobs:
           python tools/ci/build_test_map.py --coverage-file .coverage --output .ci/test-map.json --root .
 
       - name: Cache test map
-        uses: actions/cache@v4
+        uses: actions/cache@v5
         with:
           path: .ci/test-map.json
           key: test-map-${{ github.sha }}