Update test matrix

Author: kipcole9

.github/workflows/ci.yml

@@ -27,18 +27,14 @@ jobs:
       matrix:
         include:
           # minimum required versions
-          # - otp: "26.2.5.6"
-          #   elixir: "1.15.4-otp-26"
-          # - otp: "26.2.5.6"
-          #   elixir: "1.16.2-otp-26"
-          # - otp: "26.2.5.6"
-          #   elixir: "1.17.2-otp-26"
-          # - otp: "27.2"
-          #   elixir: "1.17.2-otp-27"
-          # - otp: "27.2"
-          #   elixir: "1.18.4-otp-27"
           - otp: "27.2.4"
             elixir: "1.18.4-otp-27"
+          - otp: "28.3.1"
+            elixir: "1.18.4-otp-28"
+          - otp: "27.2.4"
+            elixir: "1.19.5-otp-27"
+          - otp: "28.3.1"
+            elixir: "1.19.5-otp-28"
             lint: true
     steps:
     # Step: Setup Elixir + Erlang image as the base.