Bump julia-actions/cache from 1 to 2 (#2950)

Bumps [julia-actions/cache](https://github.com/julia-actions/cache) from 1 to 2.
- [Release notes](https://github.com/julia-actions/cache/releases)
- [Commits](julia-actions/cache@v1...v2)

---
updated-dependencies:
- dependency-name: julia-actions/cache
  dependency-version: '2'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

.github/workflows/ci.yml

@@ -53,7 +53,7 @@ jobs:
         with:
           version: ${{ matrix.machine.version }}
           arch: ${{ matrix.machine.arch }}
-      - uses: julia-actions/cache@v1
+      - uses: julia-actions/cache@v2
       - if: ${{ matrix.machine.downgrade }}
         uses: julia-actions/julia-downgrade-compat@v2
         with: