Remove OTP 23 and earlier from CI

Author: fhunleth

.github/workflows/build.yml

@@ -12,9 +12,6 @@ jobs:
           - { otp: '25', elixir: '1.14' }
           - { otp: '25', elixir: '1.13' }
           - { otp: '24', elixir: '1.12' }
-          - { otp: '23', elixir: '1.11' }
-          - { otp: '23', elixir: '1.10' }
-          - { otp: '22', elixir: '1.9' }
         os:
           - name: Linux
             runner: ubuntu-latest