Syntax error fix in ci.yml

Author: amartinhuertas

.github/workflows/ci.yml

@@ -13,7 +13,7 @@ jobs:
       - uses: julia-actions/julia-buildpkg@latest
       - uses: julia-actions/julia-runtest@latest
   MPIPETScCommTests:
-    runs-on: ubuntu-latest 
+   runs-on: ubuntu-latest 
    steps:
      - uses: actions/checkout@v2
      - uses: julia-actions/setup-julia@v1