ci: add otp elixir versions

Author: trueChazza

.github/workflows/test.yml

@@ -15,8 +15,8 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        otp: [ '26' ]
-        elixir: [ '1.15' ]
+        otp: [ '26', '25', '24', '23' ]
+        elixir: [ '1.15', '1.14' ]
     steps:
       - uses: actions/checkout@v3
       - uses: erlef/setup-beam@v1