Bump julia-actions/cache from 1.2.2 to 1.5.2 (#688)

Bumps [julia-actions/cache](https://github.com/julia-actions/cache) from 1.2.2 to 1.5.2.
- [Release notes](https://github.com/julia-actions/cache/releases)
- [Commits](julia-actions/cache@569d290...dc1a3cd)

---
updated-dependencies:
- dependency-name: julia-actions/cache
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/exercise-tests.yml

@@ -32,7 +32,7 @@ jobs:
         with:
           version: ${{ matrix.julia-version }}
 
-      - uses: julia-actions/cache@569d290d51d6c22c1cd4ceec591a1bf112aab9c0
+      - uses: julia-actions/cache@dc1a3cdeacb521b0ca93cfc66143fcadb15a5bd0
 
       - name: Install test dependencies
         run: julia --color=yes --project -e "using Pkg; Pkg.instantiate()"