Update ex version to 1.9.1 in workflow

Author: sahil290791

.github/workflows/elixir.yml

@@ -17,7 +17,7 @@ jobs:
     - name: Set up Elixir
       uses: erlef/setup-elixir@885971a72ed1f9240973bd92ab57af8c1aa68f24
       with:
-        elixir-version: '1.10.3' # Define the elixir version [required]
+        elixir-version: '1.9.1' # Define the elixir version [required]
         otp-version: '22.3' # Define the OTP version [required]
     - name: Restore dependencies cache
       uses: actions/cache@v2