Bump julia-actions/cache from 1.3.0 to 1.5.1

Bumps [julia-actions/cache](https://github.com/julia-actions/cache) from 1.3.0 to 1.5.1.
- [Release notes](https://github.com/julia-actions/cache/releases)
- [Commits](julia-actions/cache@v1.3.0...v1.5.1)

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

Signed-off-by: dependabot[bot] <support@github.com>

.github/workflows/CI.yml

@@ -32,7 +32,7 @@ jobs:
       - uses: julia-actions/setup-julia@v1
         with:
           version: ${{ matrix.version }}
-      - uses: julia-actions/cache@v1.3.0
+      - uses: julia-actions/cache@v1.5.1
       - uses: r-lib/actions/setup-r@v2
         with:
           use-public-rspm: true

.github/workflows/Docs.yml

@@ -21,7 +21,7 @@ jobs:
       - uses: julia-actions/setup-julia@v1
         with:
           version: '1'
-      - uses: julia-actions/cache@v1.3.0
+      - uses: julia-actions/cache@v1.5.1
         with:
           cache-name: 'docs'
       - run: julia -e 'using Pkg; Pkg.add("Revise");'