Update elixir.yml

Author: princemaple

.github/workflows/elixir.yml

@@ -14,10 +14,10 @@ jobs:
     steps:
     - uses: actions/checkout@v2
     - name: Setup elixir
-      uses: actions/setup-elixir@v1
+      uses: erfel/setup-elixir@v1
       with:
-        elixir-version: "1.10"
-        otp-version: "22.3"
+        elixir-version: "1.11"
+        otp-version: "23"
     - name: Install Dependencies
       run: mix deps.get
     - name: Run Tests