Bump julia-actions/cache from 2 to 3 (#2968)

Bumps [julia-actions/cache](https://github.com/julia-actions/cache) from 2 to 3.
- [Release notes](https://github.com/julia-actions/cache/releases)
- [Commits](julia-actions/cache@v2...v3)

---
updated-dependencies:
- dependency-name: julia-actions/cache
  dependency-version: '3'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

.github/workflows/ci.yml

@@ -52,7 +52,7 @@ jobs:
         with:
           version: ${{ matrix.machine.version }}
           arch: ${{ matrix.machine.arch }}
-      - uses: julia-actions/cache@v2
+      - uses: julia-actions/cache@v3
       - if: ${{ matrix.machine.downgrade }}
         uses: julia-actions/julia-downgrade-compat@v2
         with:

.github/workflows/solver-tests.yml

@@ -99,7 +99,7 @@ jobs:
       - uses: julia-actions/setup-julia@v2
         with:
           version: '1'
-      - uses: julia-actions/cache@v2
+      - uses: julia-actions/cache@v3
       - uses: julia-actions/julia-buildpkg@v1
       # Setup BARON.jl
       - name: Setup BARON