Bump julia-actions/cache from 2 to 3 (#369)

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

Author: dependabot[bot]

.github/workflows/ci.yml

@@ -38,7 +38,7 @@ jobs:
         with:
           version: ${{ matrix.version }}
           arch: ${{ matrix.arch }}
-      - uses: julia-actions/cache@v2
+      - uses: julia-actions/cache@v3
       - uses: julia-actions/julia-buildpkg@v1
       - uses: julia-actions/julia-runtest@v1
         env: 
@@ -62,7 +62,7 @@ jobs:
       - uses: julia-actions/setup-julia@latest
         with:
           version: '1'
-      - uses: julia-actions/cache@v2
+      - uses: julia-actions/cache@v3
       - name: Install documentation dependencies
         run: |
           xvfb-run -s '-screen 0 1024x768x24' julia --project=docs -e '