Upgrading julia-actions/setup-julia to @v2

Author: pebeto

.github/workflows/ci.yml

@@ -27,7 +27,7 @@ jobs:
           - x64
     steps:
       - uses: actions/checkout@v2
-      - uses: julia-actions/setup-julia@v1
+      - uses: julia-actions/setup-julia@v2
         with:
           version: ${{ matrix.version }}
           arch: ${{ matrix.arch }}