Bump julia-actions/cache from 2 to 3 (#68)

Author: dependabot[bot]

.github/workflows/CI.yml

@@ -35,7 +35,7 @@ jobs:
         with:
           version: ${{ matrix.version }}
           arch: ${{ matrix.arch }}
-      - uses: julia-actions/cache@v2
+      - uses: julia-actions/cache@v3
       - uses: julia-actions/julia-buildpkg@latest
       - uses: julia-actions/julia-runtest@latest
         env: