Update Elixir version in CI (#204)

Author: hkrutzer

.github/workflows/ci.yml

@@ -8,7 +8,7 @@ on:
 
 jobs:
   mix_test:
-    runs-on: ubuntu-22.04
+    runs-on: ubuntu-24.04
     env:
       MIX_ENV: test
       HTML5EVER_BUILD: "true"
@@ -20,11 +20,11 @@ jobs:
       matrix:
         include:
           - pair:
-              elixir: 1.13.4
+              elixir: 1.14.5
               otp: "24.3"
           - pair:
-              elixir: 1.16.1
-              otp: "26.2"
+              elixir: 1.18.4
+              otp: "27.3"
             lint: lint
     steps:
       - uses: actions/checkout@v4