add the julia version to the cache key

Co-authored-by: Claude <[email protected]>

Author: SebastianM-C

.github/workflows/CI.yml

@@ -57,10 +57,10 @@ jobs:
           cache-name: cache-artifacts
         with:
           path: ~/.julia/artifacts
-          key: ${{ runner.os }}-test-${{ env.cache-name }}-${{ hashFiles('**/Project.toml') }}
+          key: ${{ runner.os }}-test-${{ matrix.version }}-${{ env.cache-name }}-${{ hashFiles('**/Project.toml') }}
           restore-keys: |
-            ${{ runner.os }}-test-${{ env.cache-name }}-
-            ${{ runner.os }}-test-
+            ${{ runner.os }}-test-${{ matrix.version }}-${{ env.cache-name }}-
+            ${{ runner.os }}-test-${{ matrix.version }}-
             ${{ runner.os }}-
       - uses: julia-actions/julia-buildpkg@v1
       - if: ${{ matrix.group == 'OptimizationQuadDIRECT' }}