Bump julia-actions/cache from 1 to 2 (timholy#817)

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-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

.github/workflows/ci.yml

@@ -36,7 +36,7 @@ jobs:
         version: ${{ matrix.version }}
         arch: ${{ matrix.arch }}
         show-versioninfo: ${{ matrix.version == 'nightly' }}
-    - uses: julia-actions/cache@v1
+    - uses: julia-actions/cache@v2
     - uses: julia-actions/julia-buildpkg@latest
     # Revise's tests need significant customization
     # Populate the precompile cache with an extraneous file, to catch issues like in #460