fix github action

Author: tyrchen

.github/workflows/build.yml

@@ -8,8 +8,8 @@ jobs:
     name: OTP ${{matrix.otp}} / Elixir ${{matrix.elixir}}
     strategy:
       matrix:
-        otp: [23]
-        elixir: [1.10, 1.11]
+        otp: [23.1]
+        elixir: [1.11]
     steps:
       - uses: actions/checkout@v2
       - uses: actions/setup-elixir@v1