Update julia-actions/cache

Author: Sbozzolo

.github/workflows/downstream.yml

@@ -25,7 +25,7 @@ jobs:
       - uses: julia-actions/setup-julia@v1
         with:
           version: '1.10'
-      - uses: julia-actions/cache@v1
+      - uses: julia-actions/cache@v2
       - uses: julia-actions/julia-buildpkg@v1
       - uses: actions/checkout@v4
         with: