update actions/cache -> julia-actions/cache

Author: anthony

.github/workflows/ci.yml

@@ -29,7 +29,7 @@ jobs:
         with:
           version: ${{ matrix.version }}
           arch: ${{ matrix.arch }}
-      - uses: actions/cache@v1
+      - uses: julia-actions/cache@v1
         env:
           cache-name: cache-artifacts
         with:
@@ -63,4 +63,4 @@ jobs:
             using Documenter: DocMeta, doctest
             using MLJModelInterface
             DocMeta.setdocmeta!(MLJModelInterface, :DocTestSetup, :(using MLJModelInterface); recursive=true)
-            doctest(MLJModelInterface)'
+            doctest(MLJModelInterface)'