Bump julia-actions/cache from 1 to 2

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] <support@github.com>

Author: dependabot[bot]

.github/workflows/benchmark_pr.yml

@@ -17,7 +17,7 @@ jobs:
             - uses: julia-actions/setup-julia@v1
               with:
                 version: "1.8"
-            - uses: julia-actions/cache@v1
+            - uses: julia-actions/cache@v2
             - name: Extract Package Name from Project.toml
               id: extract-package-name
               run: |