Update ci.yml

Author: wojtekmach

.github/workflows/ci.yml

@@ -31,7 +31,7 @@ jobs:
           elixir-version: ${{matrix.pair.elixir}}
 
       - name: Install Dependencies
-        run: deps.get --only test
+        run: mix deps.get --only test
 
       - run: mix format --check-formatted
         if: ${{ matrix.lint }}